Updated on 2024/02/07

写真a

 
KANO Jun
 
Organization
Faculty of Environmental, Life, Natural Science and Technology Associate Professor
Position
Associate Professor
Contact information
メールアドレス
External link

Degree

  • 博士(理学) ( 北海道大学 )

Research Interests

  • catalysis

  • ferroelectrics

  • semiconducting property

  • electronic structure

Research Areas

  • Nanotechnology/Materials / Thin film/surface and interfacial physical properties

  • Natural Science / Semiconductors, optical properties of condensed matter and atomic physics  / dielectrics

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Catalyst and resource chemical process

  • Nanotechnology/Materials / Inorganic compounds and inorganic materials chemistry

Education

  • Hokkaido University   大学院理学研究科   物理学専攻

    1999.4 - 2004.3

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  • Hokkaido University   理学部   数学科

    1995.4 - 1999.3

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  • Taki senior high school    

    1991.4 - 1994.3

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Research History

  • CentraleSupélec   研究員

    2023.6

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    Country:France

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  • CentraleSupélec   Researcher

    2017.4 - 2018.3

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    Country:France

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  • Okayama University   Department of applied chemistry and biotechnology   Associate Professor

    2014.4

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  • JST   PRESTO Researcher

    2013.10 - 2017.3

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  • Okayama University   Department of Physics   Lecturer

    2010.4 - 2014.3

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  • University of Tsukuba   Graduate School of Pure and Applied Sciences   Assistant Professor

    2006.4 - 2010.3

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  • University of Tsukuba   Graduate School of Pure and Applied Sciences   Research Assistant

    2004.4 - 2006.3

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Professional Memberships

Committee Memberships

  • 日本物理学会   領域10誘電体分科運営委員  

    2021.4 - 2022.3   

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    Committee type:Academic society

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  • 15th Russia/CIS/Baltic/Japan Symposium on Ferroelectricity (RCBJSF)2020   STEERING COMMITTIEE CHAIRPERSON  

    2019.6   

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    Committee type:Academic society

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  • International Microprocesses and Nanotechnology Conference (MNC)   Program committee of 2-4: Inorganic Nanomaterials  

    2018.4   

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  • 日本MRS   MRS-Jニュース編集委員  

    2015.6   

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    Committee type:Academic society

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  • Joint RCBJSF-IWRF Conferences   Program Committees  

    2015.6 - 2016.6   

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    Committee type:Academic society

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  • 日本物理学会   領域10誘電体分科世話人  

    2008.5 - 2009.4   

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Papers

  • Ferroelectric Skewed Electronic Band Structure―New Way of Ferroic Semiconductor Invited Reviewed

    Jun Kano, Norihiro Oshime, Eiji Ikenaga, Shintaro Yasui

    77 ( 7 )   469 - 474   2022.7

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)  

    CiNii Books

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  • High valence states of Pd supported on ferroelectric BaTiO3 driven by electric polarization Reviewed

    Tasuku Yoshida, Jun Kano, Masaichiro Mizumaki, Yusuke Tamenori, Kiyofumi Nitta, Kazuo Kato, Satoshi Hinokuma, Norihiro Oshime, Satoshi Hirose, Hitoshi Mikami, Naoshi Ikeda, Tatsuo Fujii, Yuta Nishina, Tomoko Okubo

    Applied Physics Letters   119 ( 9 )   092904 - 092904   2021.8

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:AIP Publishing  

    At a metal-ferroelectric junction, it has been considered that the electric polarization of the ferroelectric material can affect the electronic structure of the neighboring metal. Here, we demonstrate that the valence state of Pd can be shifted to the unstable high value of 4+ by the electric field of electric polarization in ferroelectric BaTiO3. Study of the absorption fine structure of both hard and soft x rays revealed the existence of Pd4+ states on the surface of Pd oxide nanoparticles. The positions of Pd and oxygen atoms are shifted in opposite directions by the electric field due to the electric polarization of ferroelectric BaTiO3. The atomic displacement of Pd and O forms a zigzag structure, in which the coordination number of Pd atoms is changed from four to six, producing a quadrivalent state. This report presents experimental evidence that ferroelectric polarization can control the electronic states of neighboring metal atoms, and we suggest that using the ferroelectric support effect may produce a new type of catalyst.

    DOI: 10.1063/5.0066289

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  • Direct observation of skewed band structure induced by spontaneous polarization on ferroelectric BaTiO3 Invited Reviewed

    押目典宏, 狩野旬

    放射光   34 ( 4 )   225 - 234   2021.7

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    Authorship:Last author   Language:Japanese  

    J-GLOBAL

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  • Electronic Structure of Ferroelectrics-Skewed Band Structure Induced by the Depolarizing Field- Invited Reviewed

    狩野旬, 押目典宏, 池永英司, 安井伸太郎, 日隈聡士, 保井晃

    セラミックス   56 ( 7 )   463 - 466   2021.7

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    J-GLOBAL

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  • Light reflectance and photoelectron yield spectroscopy enable acceptor level measurement in p-type Ba1-xTiO3 semiconductor Reviewed

    Saya Fujii, Jun Kano, Norihiro Oshime, Tohru Higuchi, Yuta Nishina, Tatsuo Fujii, Naoshi Ikeda, Hiromi Ota

    JOURNAL OF APPLIED PHYSICS   129 ( 8 )   2021.2

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER INST PHYSICS  

    We report the band structure of Ba-deficient BaTiO3 as a p-type semiconductor, studied by a combination of light reflectance and photoelectron yield spectroscopy. Two acceptor levels were observed at the tail of a valence band. As the quantity of Ba vacancies increased, the density of state of the two acceptor levels also increased. The levels of the conduction band minimum and the valence band maximum shifted far away from the vacuum level, but the bandgap seems to be independent of Ba deficient concentration. For classical semiconductors such as Si and GaAs, the observation of impurity levels is restricted to low temperatures (similar to 20K) owing to their narrow bandgaps. Oxide semiconductors have now been demonstrated with wide bandgaps and acceptor levels, at normal operating temperatures, which could lead to new device designs in the future.

    DOI: 10.1063/5.0033761

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  • Skewed electronic band structure induced by electric polarization in ferroelectric BaTiO<inf>3</inf> Reviewed

    Norihiro Oshime, Jun Kano, Eiji Ikenaga, Shintaro Yasui, Yosuke Hamasaki, Sou Yasuhara, Satoshi Hinokuma, Naoshi Ikeda, Pierre Eymeric Janolin, Jean Michel Kiat, Mitsuru Itoh, Takayoshi Yokoya, Tatsuo Fujii, Akira Yasui, Hitoshi Osawa

    Scientific Reports   10 ( 1 )   2020.12

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    Authorship:Corresponding author   Publishing type:Research paper (scientific journal)  

    © 2020, The Author(s). Skewed band structures have been empirically described in ferroelectric materials to explain the functioning of recently developed ferroelectric tunneling junction (FTJs). Nonvolatile ferroelectric random access memory (FeRAM) and the artificial neural network device based on the FTJ system are rapidly developing. However, because the actual ferroelectric band structure has not been elucidated, precise designing of devices has to be advanced through appropriate heuristics. Here, we perform angle-resolved hard X-ray photoemission spectroscopy of ferroelectric BaTiO3 thin films for the direct observation of ferroelectric band skewing structure as the depth profiles of atomic orbitals. The depth-resolved electronic band structure consists of three depth regions: a potential slope along the electric polarization in the core, the surface and interface exhibiting slight changes. We also demonstrate that the direction of the energy shift is controlled by the polarization reversal. In the ferroelectric skewed band structure, we found that the difference in energy shifts of the atomic orbitals is correlated with the atomic configuration of the soft phonon mode reflecting the Born effective charges. These findings lead to a better understanding of the origin of electric polarization.

    DOI: 10.1038/s41598-020-67651-w

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  • 強誘電性電荷揺らぎ を利用した触媒設計 Invited Reviewed

    狩野旬

    セラミックス   48 ( 7 )   525 - 531   2013.7

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    Authorship:Lead author, Corresponding author   Language:Japanese  

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  • Pure lead nanoparticles with stable metallic surfaces, on perovskite lead strontium titanate particles Reviewed

    Jun Kano, Tokushi Kizuka, Fumihito Shikanai, Seiji Kojima

    NANOTECHNOLOGY   20 ( 29 )   2009.7

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:IOP PUBLISHING LTD  

    We demonstrate an efficient method of fabrication for pure lead nanoparticles with non-oxidized surfaces, supported on perovskite lead strontium titanate particles with a size distribution from tens to several hundreds of nanometers. The fabrication method is based on o-precipitation and subsequent annealing in air at 600 degrees C. Transmission electron microscopy revealed that the pure lead nanoparticles show structural fluctuations under intense electron-beam irradiation, like gold and platinum nanoparticles.

    DOI: 10.1088/0957-4484/20/29/295704

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  • A gradational system for ferroelectric nanosized (Pb0.7Sr0.3)TiO3 particles Reviewed

    Fumihito Shikanai, Jun Kano, Hiroshi Sawa, Fan Zhang, Tomoaki Karaki, Masatoshi Adachi, Je-Geun Park, Seiji Kojima, Susumu Ikeda, Takashi Kamiyama

    JOURNAL OF PHYSICS-CONDENSED MATTER   21 ( 2 )   2009.1

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IOP PUBLISHING LTD  

    Synchrotron radiation x-ray diffraction measurement was performed to investigate the size effect in ferroelectric nanosized (Pb0.7Sr0.3)TiO3 particles with various sizes ranging from 10 to 200 nm. The 200 and 002 Bragg reflections were separated using low energy synchrotron radiation x-rays. The peak profiles of the 002 reflections show a large broadening and asymmetry for all particle sizes compared with those of the 200 reflections. These anomalously wide and asymmetric peak profiles become marked for peaks with a large l. The aspect ratio of the lattice constants c/a and the atomic distance between the anions and cations decrease gradually in the vicinity of the surface of the particles, indicating that the asymmetrical profiles can be attributed to the formation of a gradational system.

    DOI: 10.1088/0953-8984/21/2/025903

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  • Influence of Pt-loading on the energy band gap and gas sensing of titanium perovskite

    Zamaswazi P. Tshabalala, Jun Kano, Hendrik C. Swart, David E. Motaung

    Physica B: Condensed Matter   676   415687 - 415687   2024.3

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.physb.2024.415687

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  • Self-growth of silver tree-like fractal structures and their surface-enhanced Raman application Invited Reviewed

    Nobuyuki Takeyasu, Jun Kano, Takahiro Ohkubo, Toshihiko Kiwa, Qingyuan Ma, Satoru Shoji

    Photonics NEWS   9 ( 2 )   83 - 87   2023.12

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  • Coating silver tree‐like fractal structure with silica layer for inhibiting chemical reactions of analytes in surface‐enhanced Raman scattering Reviewed

    Hiroya Watanabe, Yurin Hishii, Kanna Kishimoto, Kohei Nogami, Qingyuan Ma, Tomoya Niki, Tomoki Kotani, Toshihiko Kiwa, Satoru Shoji, Takahiro Ohkubo, Jun Kano, Nobuyuki Takeyasu

    physica status solidi (a)   2023.8

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    Publishing type:Research paper (scientific journal)   Publisher:Wiley  

    Silica coating is performed onto silver tree‐like fractal structures, which are self‐grown in a solution, through a wet process using tetraethyl orthosilicate. Surface‐enhanced Raman scattering (SERS) of para‐aminothiophenol (p‐ATP) is measured on the silver tree‐like fractal structures with/without silica layer at the excitation wavelength of 532 nm. p‐ATP is chemically transformed into dimercaptoazobenzene (DMAB) on the non‐coated silver tree‐like fractal structures, where DMAB peaks are clearly observed, during the SERS measurements. The DMAB peaks decrease/disappear on the silica‐coated ones although the p‐ATP peaks were observed. The results indicate that the chemical transformation is inhibited on the silica‐coated ones. The sensitivity is decreased by half compared to the non‐coated silver tree‐like fractal structures, where the lower detection limit is estimated to be ∽2×10‐5 mol/L for p‐ATP. The silica coating is advantageous for inhibiting chemical transformations of analytes, enabling identification/estimation of chemicals in unknown sample with SERS similarly to conventional Raman spectroscopy.

    This article is protected by copyright. All rights reserved.

    DOI: 10.1002/pssa.202300085

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  • Co-substituted Ca–La magnetoplumbite ferrite microwave absorbers at 100 GHz Reviewed

    Kazushige Hyodo, Jun Kano, Makoto Nakanishi, Tatsuo Fujii

    Applied Physics Letters   122 ( 11 )   2023.3

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    Millimeter wave absorption exceeding 70 GHz has been performed in a Co-substituted Ca–La magnetoplumbite (M-type) ferrite. A polymerized complex method was used to increase the substitution of La and Co ions in the M-type ferrite. The increase in the magnetic anisotropy field combined with the remaining significant saturation magnetization results in good magnetic resonance absorption in the millimeter range of 70–100 GHz. Above 70 GHz, good millimeter wave absorption of more than −20 dB was achieved in 0.25 mm thickness plates of Ca0.46La0.54Fe11Co0.28O19-η and Ca0.42La0.58Fe11Co0.58O19-η. Highly Co-substituted Ca–La M-type ferrites may, thus, be promising candidates for magnetic absorption materials operating in frequencies of up to 100 GHz.

    DOI: 10.1063/5.0133578

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  • Direct measurement of electrocaloric effect based on multi-harmonic lock-in thermography

    Ryo Iguchi, Daisuke Fukuda, Jun Kano, Takashi Teranishi, Ken-ichi Uchida

    Applied Physics Letters   122 ( 8 )   2023.2

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    We report on a direct measurement method for electrocaloric effects, the heating/cooling upon application/removal of an electric field in dielectric materials, based on a lock-in thermography technique. By use of sinusoidal excitation and multi-harmonic detection, the actual temperature change can be measured by a single measurement in the frequency domain even when the electrocaloric effect shows a nonlinear response to the excitation field. We demonstrated the method by measuring the temperature dependence of the electric-field-induced temperature change in two Sr-doped BaTiO3 systems with different ferroelectric-paraelectric phase transition temperatures, where we introduce the procedure for extracting the pure electrocaloric contribution free from heat losses and Joule heating due to leakage currents. This method can be used irrespective of the type of dielectric material and enables simultaneous estimation of the polarization change and power dissipation during the application of an electric field, making it a convenient imaging measurement method for the electrocaloric effect.

    DOI: 10.1063/5.0137686

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  • DNN-based identification for cell differentiation processes under an electronic field stimulation -the second report-

    Rin Fukui, Yoshitaka Yamamoto, Jun Kano, Keiko Sakai

    127   08   2022.11

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    DOI: 10.11517/jsaikbs.127.0_08

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  • Hot Electron Extraction in SWCNT/TiO2 for Photocatalytic H2 Evolution from Water Reviewed

    Masahiro Yamagami, Tomoyuki Tajima, Zihao Zhang, Jun Kano, Ki-ichi Yashima, Takana Matsubayashi, Huyen Khanh Nguyen, Naoto Nishiyama, Tomoya Hayashi, Yutaka Takaguchi

    Nanomaterials   12 ( 21 )   3826 - 3826   2022.10

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    Single-walled carbon nanotube (SWCNT)/TiO2 hybrids were synthesized using 1,10-bis(decyloxy)decane-core PAMAM dendrimer as a molecular glue. Upon photoirradiation of a water dispersion of SWCNT/TiO2 hybrids with visible light (λ &gt; 422 nm), the hydrogen evolution reaction proceeded at a rate of 0.95 mmol/h·g in the presence of a sacrificial agent (1-benzyl-1,4-dihydronicotinamide, BNAH). External quantum yields (EQYs) of the hydrogen production reaction photosensitized by (6,5), (7,5), and (8,3) tubes were estimated to be 5.5%, 3.6%, and 2.2%, respectively, using monochromatic lights corresponding to their E22 absorptions (570 nm, 650 nm, and 680 nm). This order of EQYs (i.e., (6,5) &gt; (7,5) &gt; (8,3)SWCNTs) exhibited the dependence on the C2 energy level of SWCNT for EQY and proved the hot electron extraction pathway.

    DOI: 10.3390/nano12213826

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  • Self-growth of silver tree-like fractal structures with different geometries Reviewed

    Kohei Nogami, Kanna Kishimoto, Yuki Hashimoto, Hiroya Watanabe, Yurin Hishii, Qingyuan Ma, Tomoya Niki, Tomoki Kotani, Toshihiko Kiwa, Satoru Shoji, Takahiro Ohkubo, Jun Kano, Nobuyuki Takeyasu

    Applied Physics A   128 ( 10 )   860   2022.10

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    Silver tree-like fractal structures are self-grown, where needle growths and branching are iterated, via rapid reduction of silver ions in a solution. Many self-similar frameworks exist at different scales in the whole structure, and geometry is characterized by a fractal dimension. Here, we perform a control of the fractal geometry by facile growth engineering related to the viscosity of the solvent, with acetone and ethanol, on the silver tree-like structure. The geometry changed from needle leaf-like to broadleaf-like structure as the viscosity increased, which resulted in the difference in the fractal dimensions ranging from 1.743 to 1.812, at 303 K. The silver fractal structures exhibited optical responses over a wide wavelength range from 400 to 900 nm, which was also visualized by the dark-field observations with an optical microscope. We demonstrated surface-enhanced Raman scattering (SERS) measurements of para-aminothiophenol at 532, 633, and 785 nm on the silver tree-like fractal structures with three types of different fractal geometries. Compared with the common SERS substrates, the merit of using dendrite structures is the availability of multiple laser wavelengths for SERS excitation and detection on the same sample, with keeping significant enhancement effect. This feature also allows us direct observation of plasmon-mediated chemical transformations of molecules through multi-color excitation SERS measurements.

    DOI: 10.1007/s00339-022-05976-1

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    Other Link: https://link.springer.com/article/10.1007/s00339-022-05976-1/fulltext.html

  • Towards an DNN-based identification for cell differentiation processes under an electronic field stimulation

    Rin Fukui, Masato Nakayama, Yoshitaka Yamamoto, Jun Kano, Keiko Sakai, Minami Taga, Tetsuya Takeda, Hisao Moriya, Nobuyuki Takeyasu

    125   07   2022.3

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    DOI: 10.11517/jsaikbs.125.0_07

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  • Single domain growth and charge ordering of epitaxial YbFe2O4 films Reviewed

    Takumi Sakagami, Reika Ota, Jun Kano, Naoshi Ikeda, Tatsuo Fujii

    CRYSTENGCOMM   2021.8

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

    YbFe<INF>2</INF>O<INF>4</INF> is a charge-ordered ferroelectric that exhibits coupling between magnetization and electric polarization near room temperature and crystallizes in a rhombohedral structure (R3m). This study presents an attempt to fabricate stoichiometric and epitaxial YbFe<INF>2</INF>O<INF>4-delta</INF> films with a nearly single-domain structure using an RF magnetron sputtering method. The (0001)-oriented epitaxial films of YbFe<INF>2</INF>O<INF>4-delta</INF> on YSZ (111) substrates via reactive sputtering method exhibited clear three-fold symmetry normal to the substrate without the formation of twin domains rotated by 60 degrees. The oxygen stoichiometry of the epitaxial YbFe<INF>2</INF>O<INF>4-delta</INF> was improved by controlling an oxygen partial pressure (P<INF>O<INF>2</INF></INF>) during the deposition. The films showed a sharp ferrimagnetic transition, and the transition temperature (T<INF>N</INF>) increased linearly to approximately 245 K with decreasing P<INF>O<INF>2</INF></INF>. The magnitude of magnetization of the obtained films was comparable to that of bulk single crystals. Further, the electron diffraction pattern of the stoichiometric films confirmed the presence of three-dimensional charge order, which is consistent with the behavior of the bulk crystals as well.

    DOI: 10.1039/d1ce00834j

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  • Skewing of electronic band along the direction of electric polarization in ferroelectrics Invited Reviewed

    Jun Kano, Norihiro Oshime

    SPring-8/SACLA Research Frontiers 2020   58 - 59   2021.8

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  • Surface Electron-Ion Mixed Conduction of BaTiO3-delta Thin Film with Oxygen Vacancies Reviewed

    Tomoasa Takada, Takeshi Fujita, Takehiro Imagawa, Emi Yamamoto, Jun Kano, Daisuke Shiga, Koji Horiba, Hiroshi Kumigashira, Tohru Higuchi

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   90 ( 1 )   2021.1

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:PHYSICAL SOC JAPAN  

    A BaTiO3-delta thin film with oxygen vacancies was prepared on a Pt/Al2O3 (0001) substrate by RF magnetron sputtering. The prepared thin film was preferentially grown in the [111] direction. The BaTiO3-delta thin film with a reduced interplanar distance (d(111)) exhibited the Ti3+ valence state of 4.4%, which is closely related to concentration of oxygen vacancies. The activation energy estimated from the Arrhenius plot of the electrical conductivity was approximately 61 meV. The electrical conductivity of similar to 10(-5) S/cm at room temperature did not depend on the oxygen gas partial pressure. The photoemission spectra exhibited the O-H bond peak and donor state near the Fermi level. These results indicate that the BaTiO3-delta/Pt/Al2O3 (0001) thin film has surface electron -proton mixed conduction at room temperature.

    DOI: 10.7566/JPSJ.90.014707

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  • Valence control of charge and orbital frustrated system YbFe<inf>2</inf>O<inf>4</inf> with electrochemical Li+ intercalation Reviewed

    S. Murase, Y. Yoshikawa, K. Fujiwara, Y. Fukada, T. Teranishi, J. Kano, T. Fujii, Y. Inada, M. Katayama, K. Yoshii, T. Tsuji, D. Matsumura, N. Ikeda

    Journal of Physics and Chemistry of Solids   2021

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    We report an attempt valence control of the mixed valence iron triangular oxide YbFe2O4 to develop an effective technique controling the frustration of charges in strongly correlated electron systems. The electrochemical doping of Li + into YbFe2O4 was examined on a cell-type sample similar to the Li-ion secondary battery cell. Systematic changes in the lattice constant and Fe – Fe and Fe–Yb distance were observed with Li doping. Maximum value of the doping was over 300 mAh/g. An EXAFS experiment indicated that Li positioned between Yb octahedron layer (U-layer) and Fe-bipyramidal layer (W-layer). However, detailed change of iron valence state of YbFe2O4was not clearly observed because of the superimpose of the signal from iron metal nano particles in XANES observation. We discuss that the uncertainty might arise from the inhomogeneous distribution of the sample particle size, which might prevent the homogeneous doping of Li because the doping occurs on the surface of each nano-particles.

    DOI: 10.1016/j.jpcs.2021.110468

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  • Dehydrogenative Coupling of Toluene Promoted by Multi-Walled Carbon Nanotubes Reviewed

    Soliman I. El-Hout, Yang Zhou, Jun Kano, Yoshiaki Uchida, Yuta Nishina

    CATALYSIS LETTERS   150 ( 1 )   256 - 262   2020.1

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER  

    We report here the formation of carbon-carbon bonds via carbon-hydrogen bond activation catalysed by multi-walled carbon nanotubes (mwcnts), the catalytic activity of which is influenced by nanocarbon morphology and structure. Control of nanocarbon defects and edges allows the realisation of a high-performance carbon-based catalyst that can replace its metal-based counterparts.[GRAPHICS].

    DOI: 10.1007/s10562-019-02951-z

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  • Cuticle network and orientation preference of photonic crystals in the scales of the weevil Lamprocyphus augustus Reviewed

    R. Ebihara, H. Hashimoto, J. Kano, T. Fujii, S. Yoshioka

    Journal of The Royal Society Interface   15 ( 145 )   20180360 - 20180360   2018.8

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    Publishing type:Research paper (scientific journal)   Publisher:The Royal Society  

    This paper reports the structural and optical investigations of the structural colour of the weevil
    <italic>Lamprocyphus</italic>
    <italic>augustus</italic>
    . The photonic crystal structure within the weevil's scales was investigated using sequential focused ion-beam milling and scanning electron microscopy imaging. We carefully analysed the reconstructed three-dimensional structure to determine the unit cell of the photonic crystal. It was found that the cuticle network of the cubic unit cell perfectly matches the previously reported diamond-based network. However, different results were obtained for the crystal orientations of the small crystal domains that comprise the entire photonic crystal structure in the scales:
    <monospace>&lt;111&gt;</monospace>
    directions are highly preferred along the surface normal of the scale. This finding explains the fact that the scale is almost uniformly coloured despite the multi-domain structure. It is confirmed experimentally and theoretically that the wavelength range of the reflection band corresponds to the gap of the photonic band.

    DOI: 10.1098/rsif.2018.0360

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    Other Link: https://royalsocietypublishing.org/doi/full-xml/10.1098/rsif.2018.0360

  • Synthesis of nano-crystalline LiNbO3-decorated LiCoO2 and resulting high-rate capabilities Reviewed

    Takashi Teranishi, Masahiro Inohara, Jun Kano, Hidetaka Hayashi, Akira Kishimoto, Koji Yoda, Hidefumi Motobayashi, Yuzo Tasaki

    Solid State Ionics   314   57 - 60   2018.1

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier B.V.  

    We decorated nano-crystalline LiNbO3 (LN) particles, which played the role of artificial solid electrolyte interfaces (SEIs) on an active material, namely LiCoO2 (LC). Conventional one-step synthesis using metal organic decomposition (MOD) was used initially, but resulted in the presence of an undesired Li-rich compound, Li3NbO4 (L3N), along with a counterpart phase, Co3O4. Hence, we incorporated crystalline LN into the LC matrix via a two-step synthesis method. Treatment at 500–700 °C resulted in single-phase LN-decorated LCs with improved high rate capabilities. The improvement in the rate capability is related to the temperature dependencies of the two most important parameters: 1) the degree of LN crystallinity, which corresponds to the improvement in the polarization, and 2) the density of the triple phase junctions, which act as active Li ion pathways. The optimized capacity, 78 mAh/g at 20 C, of the specimen annealed at 600 °C was 20 C, which is approximately 1.7-fold larger than that of amorphous LN-decorated LC and is 2.6 times higher than that of bare LC. This implied the introduction of a dielectric polarization architecture had a greater impact on the improvement to the rate capability than Li transportation through the amorphous LN.

    DOI: 10.1016/j.ssi.2017.11.020

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  • Growth and charge ordering of epitaxial YbFe2O4 films on sapphire using Fe3O4 buffer layer Reviewed

    Tatsuo Fujii, Tomoya Numata, Hiroki Nakahata, Makoto Nakanishi, Jun Kano, Naoshi Ikeda

    JAPANESE JOURNAL OF APPLIED PHYSICS   57 ( 1 )   2018.1

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    Well-crystallized epitaxial YbFe2O4 films were prepared on an alpha-Al2O3(001) substrate using an Fe3O4 buffer layer. Fe3O4 has a relatively small lattice mismatch with both YbFe2O4 and alpha-Al2O3. Electron diffraction analysis combined with transmission electron microscopy revealed the epitaxial relationship to be alpha-Al2O3[110](001) parallel to Fe3O4[211](111) parallel to YbFe2O4[110](001). Moreover, superlattice spots due the Fe2+-Fe3+ charge order state of YbFe2O4 were clarified. The Fe2+/Fe3+ ratio in YbFe2O4 was nearly stoichiometric. The film exhibited a ferrimagnetic transition at similar to 220K and a nonlinear current-voltage characteristic at room temperature. These results confirmed the good crystallinity and stoichiometry of the obtained YbFe2O4 films. (C) 2018 The Japan Society of Applied Physics

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  • Possible charge order structure of stoichiometric YbFe2O4 Reviewed

    Kosuke Fujiwara, Tomoyuki Karasudani, Mamoru Fukunaga, Hiroyuki Kobayashi, Jun Kano, Pierre-Eymeric Janolin, Jean-Michel Kiat, Yoshio Nogami, Ryusuke Kondo, Naoshi Ikeda

    FERROELECTRICS   512 ( 1 )   85 - 91   2017

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    We report a possible charge ordering model of triangular mixed valence material YbFe2O4. It was found that a crystal synthesized with high stoichiometry on iron vacancy shows new and simple extinction rule in the superlattice reflections. The Laue class of the diffraction signal is expressed as 2/m. With the consideration of the charge neutrality and the superlattice signal of (1/3 1/3 0), we derived 5 possible charge ordering models of this material.

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  • Quantitative study of band structure in BaTiO3 particles with vacant ionic sites Reviewed

    Norihiro Oshime, Jun Kano, Naoshi Ikeda, Takashi Teranishi, Tatsuo Fujii, Takeji Ueda, Tomoko Ohkubo

    JOURNAL OF APPLIED PHYSICS   120 ( 15 )   2016.10

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    Levels of the conduction band minimum and the valence band maximum in ion-deficient BaTiO3 particles were investigated with optical band gap and ionization energy measurements. Though it is known that the quantification of the band structure in an insulator is difficult, due to the poor electrical conductivity of BaTiO3, systematic variation in the band energy levels was found that correlated with the introduction of vacancies. Photoelectron yield spectroscopy provided direct observation of the occupancy level of electrons, which is altered by the presence of oxygen and barium vacancies. In addition, the conduction band deviation from the vacuum level was determined by optical reflectance spectroscopy. Our results show that: (1) Introduction of oxygen vacancies forms a donor level below the conduction band. (2) The conduction band is shifted to a lower level by a larger number of oxygen vacancies, while the valence band also shifts to a lower level, due to the reduction in the density of O 2p orbitals. (3) Introduction of barium vacancies widens the band gap. Since barium vacancies can induce a small number of oxygen vacancies with accompanying charge compensation, this behavior suppresses any large formation of donor levels in the gap states, indicating that cation vacancies can control the number of both donor and acceptor levels. Published by AIP Publishing.

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  • Structural, magnetic and optical properties of YbFe2O4 films deposited by spin coating Reviewed

    Tatsuo Fujii, Naoya Okamura, Hideki Hashimoto, Makoto Nakanishi, Jun Kano, Naoshi Ikeda

    AIP ADVANCES   6 ( 8 )   2016.8

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    Rare-earth iron oxides (RFe2O4) have attracting attention as new electronic device materials because of their numerous functionalities, such as electronic ferroelectricity, ferrimagnetism, and high infrared absorption. In this paper, nearly monophasic YbFe2O4 films were prepared on alpha-Al2O3 (001) substrates by the spin coating method using an aqueous-based YbFe2O4 solution. The solution was composed of a stoichiometric ratio of Yb(CH3COO)(3) and Fe(NO3)(3) with excess chelating agents. After heat treatment above 800 degrees C, well-crystallized and highly (001)-oriented YbFe2O4 started to epitaxially form on the substrate under controlled oxygen partial pressure with H-2/CO2 gas mixtures. X-ray pole figure analysis confirmed the following epitaxial relationship: YbFe2O4[100](001)//alpha-Al2O3[100](001). Moreover formation of an Fe3O4 interracial layer between YbFe2O4 and alpha-Al2O3 was detected by high-resolution transmission electron microscopy. Presence of the Fe3O4 interracial layer seemed to release the lattice misfit with the substrate. The Fe2+/Fe3+ ratio in the obtained YbFe2O4 films was nearly stoichiometric and the indirect bandgap assigned to Fe2+ -&gt; Fe3+ charge transfer excitation was found to be similar to 0.4 eV by optical spectroscopy. A clear magnetic transition from the paramagnetic state to the ferrimagnetic state occurred at similar to 230 K. (C) 2016 Author(s).

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  • Iron vacancy effect on the magnetization of YbFe2O4 Reviewed

    Fujiwara K., Miyajima M., Fukunaga M., Kano J., Kobayashi H., Ikeda N.

    Transactions of the Materials Research Society of Japan   41 ( 1 )   139 - 142   2016

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    We report the effect of iron vacancies on the magnetic property of spin and charge ordered system YbFe2O4 single crystals. The excess amount of iron compensates for the evaporation of iron during crystal growth. We concluded that samples grown with the standard method contain iron vacancies of more than 10%. It is considered that increasing the iron in the starting material recovers the iron stoichiometry, and the proper magnetic property appears. With recovery of the chemical stoichiometry, the magnetic hysteresis loop changes from a double loop to a single loop, which indicates the development of spin coherence and the appearance of a large ferrimagnetic domain. The anomaly found in the thermomagnetization curve at approximately 150 K, the so-called TLT transition, disappears with better stoichiometry. This fact indicates that TLT is not a kind of phase transition but an effect of iron vacancy. Our discovery demonstrates that most of the crystals used in RFe2O4 research might contain many iron vacancies. The confused discussions on this material about the spin order model, the charge order model, and so on might reconsider such chemical stoichiometry, including iron vacancies.

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  • Present status of the experimental aspect of RFe2O4 study Reviewed

    Naoshi Ikeda, Tomoko Nagata, Jun Kano, Shigeo Mori

    JOURNAL OF PHYSICS-CONDENSED MATTER   27 ( 5 )   2015.2

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    We give a brief review of the experimental research on a triangular mixed valence iron oxide RFe2O4 (R = Y, Dy, Ho, Er, Tm, Yb, Lu, Sc or In). Interest in this material has been increasing every year because of the fascinating but complicated interaction between spin, charge and the orbital state of iron ions in frustrated geometry. Reports collected in this review cover experimental research on crystallography, chemical analysis, bulk and thin film preparation, magnetic, dielectric, diffraction with neutrons, x-ray and electron, optical and x-ray absorption, Mossbauer spectroscopy and other methods that incorporate the use of modern scientific technology and knowledge. The report mainly focuses on experimental facts since 1990 on which an early review by Siratori has been published (Kimizuka et al 1990 Handbook on the Physics and Chemistry of Rare Earths vol 13, ed K A Gschneidner Jr and L Eyring

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  • 10 fs Dynamics of Photoinduced Magnetic Transition in Double-Layered Charge Ordering in LuFe2O4 Under Interlayer Excitation Reviewed

    Y. Sagae, K. Yamada, T. Ishikawa, K. Itoh, H. Itoh, T. Sasaki, T. Nagata, J. Kano, T. Kambe, S. Ishihara, N. Ikeda, S. Iwai

    ULTRAFAST PHENOMENA XIX   162   252 - 256   2015

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    Photoinduced growth of the antiferromagnetic state in the ferrimagnetic phase were demonstrated in double layered Fe oxide LuFe2O4 by 12 fs infrared pulse under inter-layer excitation. Inter-layer charge imbalance successively induces the changes of charge/magnetic structures interacting with local Fe-O stretching and inter-layer sliding phonons through the exchange interaction.

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  • Valence instability of iron oxide ultrafine particles on ferroelectrics studied by Mossbauer spectroscopy Reviewed

    Jun Kano, Takumi Okamoto, Shin Nakamura, Akio Fuwa, Takafumi Otoyama, Yoshiaki Nakazaki, Hideki Hashimoto, Jun Takada, Norihiro Oshime, Miho Ito, Naoshi Ikeda

    JAPANESE JOURNAL OF APPLIED PHYSICS   53 ( 5 )   2014.5

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    Various types of iron oxides loaded on ferroelectric BaTiO3 and nonferroelectric ZrO2 supports have been studied by Fe-57 Mossbauer spectroscopy to investigate the valence instability of iron oxides affected by ferroelectric polarization fluctuation. Although the iron oxide loaded on ZrO2 shows a typical reduction process at high vacuum and high temperature, the iron oxide loaded on BaTiO3 shows an opposite process, i.e., iron oxide oxidization. We propose the dynamics of band structures of ferroelectrics in the paraelectric phase to understand this phenomenon. The oscillation of band bending causes electron transfer from an iron oxide to a ferroelectric support. This result suggests that the surface charges of ferroelectrics are useful in developing new functional materials with metal compounds. (C) 2014 The Japan Society of Applied Physics

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  • Carrier mobility of iron oxide nanoparticles supported on ferroelectrics studied by Mossbauer spectroscopy Reviewed

    T. Okamoto, J. Kano, S. Nakamura, A. Fuwa, T. Otoyama, Y. Nakazaki, H. Hashimoto, J. Takada, M. Ito, N. Ikeda

    HYPERFINE INTERACTIONS   219 ( 1-3 )   147 - 152   2013.4

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    Fe-57 Mossbauer spectroscopy was performed on two types of Fe oxide nanoparticles supported on a typical ferroelectric, BaTiO3. It was found that the valence state of FeO nanoparticles changed to a mixed 2+/3+ state at high temperature where BaTiO3 shows paraelectric behaviour. We attribute this phenomenon to the fluctuation of electric dipoles which realizes carrier injection into the Fe oxides. This is the first report which discusses a dynamical valence state of transition metal oxides supported on ferroelectrics.

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  • Magnetoelectric Effect Driven by Magnetic Domain Modification in LuFe2O4 Reviewed

    Takashi Kambe, Yukimasa Fukada, Jun Kano, Tomoko Nagata, Hiroyuki Okazaki, Takayoshi Yokoya, Shuichi Wakimoto, Kazuhisa Kakurai, Naoshi Ikeda

    PHYSICAL REVIEW LETTERS   110 ( 11 )   2013.3

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    The magnetocapacitance effect was investigated using impedance spectroscopy on single crystals of LuFe2O4. The intrinsic impedance response could be separated from the interfacial response and showed a clear hysteresis loop below T-Ferri similar to 240 K under the magnetic field. The neutron diffraction experiment under the magnetic field proves the origin of the dielectric property related to the motion of the nanosized ferromagnetic domain boundary. These results imply that the modification of the microscopic domain structure is responsible for the magnetoelectric effect in LuFe2O4. DOI: 10.1103/PhysRevLett.110.117602

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  • High-pressure synthesis, crystal structure and magnetic property of ilmenite-type FeGeO3 Reviewed

    Daisuke Nakatsuka, Takashi Yoshino, Jun Kano, Hideki Hashimoto, Makoto Nakanishi, Jun Takada, Tatsuo Fujii

    JOURNAL OF SOLID STATE CHEMISTRY   198   520 - 524   2013.2

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    We synthesized well-crystallized ilmenite-type FeGeO3 to investigate its structural and magnetic properties. Ilmenite-type FeGeO3 were synthesized by high-pressure synthesis technique using a Kawai-type multi-anvil apparatus. Their structural and magnetic properties were examined by XRD analysis with Rietveld refinement, transmission electron microscopy, Mossbauer spectroscopy and SQUID-magnetization measurements. The subsequent annealing after the high-pressure synthesis was effective to improve the crystallinity of the ilmenite-type FeGeO3. The primary particle size of ilmenitetype FeGeO3 was similar to 15 nm. Some particles seemed to be covered with non- or poorly crystalline phase even after the annealing, and others showed a lamellar microstructure parallel to the (0 0 1) plane. Theilmenite-type FeGeO3 showed typical antiferromagnetic behavior with the Neel temperature of 79 K. (c) 2012 Elsevier Inc. All rights reserved.

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  • Nonlinear Electric Conductivity of Charge Ordered System RFe2O4 (R = Lu, Yb) Reviewed

    T. Nagata, Y. Fukada, M. Kawai, J. Kano, T. Kambe, E. Dudzik, R. Feyerherm, P. E. Janolin, J. M. Kiat, N. Ikeda

    FERROELECTRICS   442 ( 1 )   45 - 49   2013

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    We report nonlinear conductivity associated with a phase transition in polar charge ordered material YbFe2O4. To investigate the existence of nonlinear conductivity, we measured temperature dependence of conductivity as a function of applied electric current and estimated the sample heating precisely. Then we found the nonlinear conductivity below three dimensional charge ordering temperature 340 K. The result is consistent with diffraction observation.

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  • Doping effects on dynamical physical properties of Ca0.6Sr0.4Bi4Ti4O15 ferroelectric ceramics with layered-perovskite structure Reviewed

    M. S. Islam, J. Kano, Q. R. Yin, S. Kojima

    JOURNAL OF ELECTROCERAMICS   28 ( 2-3 )   89 - 94   2012.5

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    The change of electrical and lattice dynamical properties of ferroelectric Ca0.6Sr0.4Bi4Ti4O15 (CSBT) ceramics were studied by doping with 0.1 wt.% of CeO2 and MnO2. The loss tangent and the AC conductivity decreased markedly due to the reduction of charge carrier. The activation energy of doped-CSBT increased owing to the reduction of intrinsic defects in the crystal lattice. For doped and pure CSBT, the appearance of thermal hysteresis and the satisfaction of the Cure-Weiss law by the dielectric susceptibility data assigned the first order nature of a ferroelectric phase transition. Especially in ferroelectric phases, the soft optic phonon mode showed the significant softening towards T-1 (at T-1, the square of soft mode frequency omega(2)(s) -&gt; 0) and omega(2)(s) was approximately proportional to T-1-T, where T-1 is similar to 70A degrees C above T-C = 672A degrees C, demonstrated a first order displacive nature of a ferroelectric phase transition. The invariance of lattice dynamical feature indicated that the crystal lattice did not influence markedly by the doping ions.

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  • Exchange Bias in Multiferroic RFe2O4 (R = Y, Er, Tm, Yb, Lu, and In) Reviewed

    Kenji Yoshii, Naoshi Ikeda, Yasuo Nishihata, Daisuke Maeda, Ryota Fukuyama, Tomoko Nagata, Jun Kano, Takashi Kambe, Yoichi Horibe, Shigeo Mori

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   81 ( 3 )   2012.3

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    An exchange bias (EB) behavior has been observed for multiferroic RFe2O4 (R Y, Er, Tm, Yb, Lu, and In). The materials with small R3+ ions (R = Tm, Yb, Lu, and In) exhibit large EB fields (greater than or similar to 1 kOe) below similar to 100-150 K. This property is rooted in a magnetically glassy state, arising from the competition between ferromagnetic and antiferromagnetic domain interactions. In addition, the EB field tends to be more enhanced for smaller R3+ ions. Hence, the EB is controlled by the substitution at the R-site in this series.

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  • Magnetic and dielectric study of Bi2CuO4 Reviewed

    K. Yoshii, T. Fukuda, H. Akahama, J. Kano, T. Kambe, N. Ikeda

    PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS   471 ( 21-22 )   766 - 769   2011.11

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    Magnetic and dielectric properties have been investigated for Bi2CuO4, which has the same chemical formula as that of the parent materials of cuprate superconductors R2CuO4 (R: rare earths). Magnetization measurements show the antiferromagnetic transition of the Cu2+ spins at similar to 42 K, as reported previously. Dielectric measurements for the frequencies of 1 kHz to 1 MHz show that the dielectric constants are 100-500 at room temperature. The dielectric dispersion reveals that the dielectric response lacks spatial coherence, a property which indicates the possible existence of phase separation as suggested for La2CuO4. The imaginary part of dielectric response gives the activation energy of 0.22 eV, suggesting that the dielectric response is governed by the electron hopping between the Cu ions. (C) 2011 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physc.2011.05.049

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  • Multiferroic Character and Magnetic Phase of LuFe2O4 Reviewed

    Daisuke Ohishi, Hironori Hayakawa, Hiroshi Akahama, Naoshi Ikeda, Takashi Kambe, Yoji Matsuo, Noboru Kimizuka, Jun Kano, Kenji Yoshii

    FERROELECTRICS   415   51 - 56   2011

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    The variation of AC dielectric constant in the function of the DC magnetic fields was found in low oxygen vacant LuFe2O4 single crystal in which the electric polarization arise from the polar charge ordering. These magneto-electric coupling should be explained by a novel mechanism where the boundary motion of the polar charge ordered domain is affected by the magnetic (spin) domain boundary motion.

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  • Electric Field Response of Stoichiometric LuFe2O4 Reviewed

    Naoshi Ikeda, Masato Kubota, Hironori Hayakawa, Hiroshi Akahama, Daisuke Ohishi, Akiko Nakanishi, Takako Funabiki, Yoji Matsuo, Noboru Kimizuka, Takashi Kambe, Shigeo Mori, Jun Kano

    FERROELECTRICS   414   41 - 47   2011

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    A characteristic nonlinear electric responses were found in a charge ordered type ferroelectrics LuFe2O4 with less oxygen deficiency. Cole - Cole circular in the dielectric response varies in the function of the amplitude of the AC electric field. With a synchrotron radiation diffraction experiment under the current revealed the variation of the coherence length of the polar charge ordered W-layer along c-axis. The nonlinear response with the increase of the electronic current may relates to the electron hopping in the charge stripe structure.

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  • Dynamical Properties of Protonic Conductor K3H(SeO4)(2) Reviewed

    Fumihito Shikanai, Keisuke Tomiyasu, Naofumi Aso, Shinichi Itoh, Susumu Ikeda, Takashi Kamiyama, Shinya Tsukada, Jun Kano, Seiji Kojima

    FERROELECTRICS   416   101 - 107   2011

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    Dynamical properties of protonic conductor K3H(SeO4)(2) were examined by using various techniques, Brillouin scattering, quasi elastic, and inelastic neutron scattering. No significant anomaly was observed in longitudinal and transverse acoustic modes. In each experiment, a Lorentzian shaped spectrum was observed at extremely low energy, (less than 0.1 meV). The spectra in Brillouin and inelastic neutron scattering at the zone boundary originate from rotational modes of SeO4 tetrahedra at Gamma- and L-point, respectively. The peak positions, shapes, and widths of the spectra are consistent with each other, while the integrated intensities show complementary temperature dependence. The lifetimes of those modes, about 10(-10) s, agree with the stationary time of conduction protons obtained from Q dependence of width in quasi elastic neutron scattering.

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  • Terahertz Spectroscopy of Electronic Ferroelectric LuFe2O4 Crystal Reviewed

    Hideaki Kitahara, Jun Kano, Yukimasa Fukada, Takashi Kambe, Naoshi Ikeda, Masanori Hangyo

    2011 36TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ)   2011

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    The frequency dependence of the complex dielectric constant of LuFe2O4 single crystal is measured by terahertz time-domain spectroscopy. We observed a broad infrared active mode in the real and imaginary parts of the complex dielectric constants at around 25 cm(-1).

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  • Acoustic phonons and a central mode in the protonic conductor K3 H (SeO4) 2 Reviewed

    Fumihito Shikanai, Shinya Tsukada, Jun Kano, Seiji Kojima

    Physical Review B - Condensed Matter and Materials Physics   81 ( 1 )   2010.1

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    The dynamical properties of protonic conductor K3 H (SeO4) 2 were examined by Brillouin scattering. Both longitudinal-acoustic modes (c33 and c11) and a transversal mode (c44) monotonously depend on temperature, and no soft mode was observed. A central mode with a width about 6 GHz was observed above phase-transition temperature, TC. The central mode has a symmetry Eg corresponding to the rotational mode of SeO4 tetrahedra. The Eg mode is compatible with a zone-boundary soft mode, L3, which accounts for the symmetrical change from R 3̄ m to C2/c. The intensity of the central mode declines in the vicinity of TC. This shows that chaotic rotational motion changes into a zone-boundary soft mode with decreasing temperature. © 2010 The American Physical Society.

    DOI: 10.1103/PhysRevB.81.012301

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  • Acoustic phonons and a central mode in the protonic conductor K3H(SeO4)(2) Reviewed

    Fumihito Shikanai, Shinya Tsukada, Jun Kano, Seiji Kojima

    PHYSICAL REVIEW B   81 ( 1 )   2010.1

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    The dynamical properties of protonic conductor K3H(SeO4)(2) were examined by Brillouin scattering. Both longitudinal-acoustic modes (c(33) and c(11)) and a transversal mode (c(44)) monotonously depend on temperature, and no soft mode was observed. A central mode with a width about 6 GHz was observed above phase-transition temperature, T-C. The central mode has a symmetry E-g corresponding to the rotational mode of SeO4 tetrahedra. The E-g mode is compatible with a zone-boundary soft mode, L-3, which accounts for the symmetrical change from R (3) over barm m to C2/c. The intensity of the central mode declines in the vicinity of T-C. This shows that chaotic rotational motion changes into a zone-boundary soft mode with decreasing temperature.

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  • Synthesis and Characterization of Ferroelectric Lead-Based Perovskite Nanoparticles Reviewed

    J. Kano, K. Kato, T. Tsukui, T. Kizuka, S. Kojima

    FERROELECTRICS   402   37 - 42   2010

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    Ferroelectric lead-based perovskite particles have been fabricated by co-precipitation method which a Ca or Ba modified Pb site. Co-precipitates were first synthesized at ambient temperature and then annealed in air at various temperatures to produce lead-base perovskite particles. We demonstrate that the morphology, crystal structure and soft mode behavior are influenced by the particle size.

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  • Finite Size Effects on the Ferroelectric Phase Transition of Bi3.5La0.5Ti3O12 Nano-Particles Reviewed

    M. S. Islam, J. Kano, S. Kojima

    FERROELECTRICS   402   16 - 22   2010

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    The size effects on the successive phase transition of lanthanum doped ferroelectric bismuth titanate Bi3.5La0.5Ti3O12 (BLT) nano-particles have been investigated. A dielectric anomaly appears around 520 degrees C for all the size of nano-particles, corresponds to the low temperature monoclinic to orthorhombic phase transition that remains unaffected by the decrease of particle size. The optical soft phonons show a considerable broadening due to the reduction of particle size and completely overdamped below 34 nm. These results demonstrate a size induced ferroelectric orthorhombic to paraelectric tetragonal phase transition. It is confirmed by the temperature-dependence of the soft optical phonon that the first order displacive nature of the orthorhombic to tetragonal phase transition is hold even in nano-system.

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  • Microstructure and Phase Transition of MnO2-Doped Bismuth Layered-Structure Ferroelectrics Reviewed

    Md Saidul Islam, Jun Kano, Shinya Tsukada, Qingrui Yin, Seiji Kojima

    JAPANESE JOURNAL OF APPLIED PHYSICS   48 ( 9 )   2009.9

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    The effects of MnO2 doping on the microstructure and phase transition of ferroelectric CaBi4Ti4O15 (CBT) ceramics with x mol % of MnO2 (CBT-xM; x = 0, 1, 3) have been studied. The single-phase crystal structure and the plate-like grain morphology are clearly observed for all compositions, while extended grains are observed with x = 3. The dielectric permittivity and dielectric loss show that the Mn2+ and Mn3+ ions are preferentially incorporated into the A- and B-sites, respectively, up to a limiting extent of approximately x = 2. The ac conductivity decreases and the activation energy increases with increasing Mn content owing to the decrease in the number of conducting carriers and increase in covalence, respectively. The Curie temperature T-C is independent of MnO2 doping within the experimental accuracy, and the dielectric constant satisfies the Curie-Weiss law above T-C. The temperature dependence of the soft mode with x = 0 and 1 shows a significant softening towards T-1 similar to T-C + 113 degrees C (at T-1, the square of the soft mode frequency omega(2)(s) -&gt; 0). omega(2)(s) is approximately proportional to T - T-1. These findings indicate that the displacive nature of the phase transition is not affected by MnO2 doping, at least below x = 3. (C) 2009 The Japan Society of Applied Physics

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  • Structural Dynamics of Lead Nanoparticles with Stable Metallic Surfaces on PbxSr1-xTiO3 Prepared by Co-Precipitation Reviewed

    Jun Kano, Tokushi Kizuka, Fumihito Shikanai, Seiji Kojima

    2009 9TH IEEE CONFERENCE ON NANOTECHNOLOGY (IEEE-NANO)   287 - 290   2009

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    An efficient fabrication method for pure lead nanoparticles supported on lead-based perovskite particles has been developed using co-precipitation. The annealing of the co-precipitates in air at 600 degrees C produced lead nanoparticles with non-oxidized and non-contaminated surfaces. High-resolution transmission electron microscopy revealed that the pure lead nanoparticles with an average size of similar to 4 nm showed structural fluctuations under an intense electron beam irradiation, similar to gold and platinum nanoparticles. This result implied that the lead nanoparticles prepared by this co-precipitation process are expected to be used as catalysts.

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  • Dynamical properties of polar nanoregions of relaxor ferroelectric Pb(Ni1/3Nb2/3)O-3-0.29PbTiO(3) Reviewed

    Shinya Tsukada, Yuji Ike, Jun Kano, Tadashi Sekiya, Yoshiro Shimojo, Ruiping Wang, Seiji Kojima

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   77 ( 3 )   2008.3

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    Dynamical properties of the polar nanoregions (PNRs) of a relaxor ferroelectric Pb(Ni1/3Nb2/3)O-3-0.29PbTiO(3) single crystal are studied by using Brillouin scattering to elucidate the mechanism of the diffuse phase transition. The temperature dependence of Brillouin scattering shows anomalies at three temperatures: at T-d related to the appearance of the PNRs, at T* associated with the growth of the PNRs, and at T-f related to the macroscopic structural phase transition; all these temperatures are closely related to the dynamical behavior of the PNRs. The thermal hysteresis around T-f in the longitudinal acoustic properties can be interpreted by considering the growth process of the PNRs. From the anomalous acoustic properties, the relaxation time of the polarization fluctuation is evaluated. It is found that the relaxational process responsible for the central peak originates from the polarization fluctuation that is coupled with the longitudinal acoustic mode.

    DOI: 10.1143/JPSJ.77.033707

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  • Temperature Evolution of the Optical Phonons in Pb(Ni(1/3)Nb(2/3))O(3) Single Crystals Studied by Raman Scattering Reviewed

    Jun Kano, Hiroki Taniguchi, Desheng Fu, Mitsuru Itoh, Seiji Kojima

    FERROELECTRICS   367   67 - 72   2008

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    Raman scattering of lead nickel niobate Pb(Ni1/3Nb2/3)O3 (PNN) single crystals grown by the flux method has been performed to investigate the temperature dependence of the optical phonons of relaxors. Anomaly of the temperature dependence of the Raman intensity at 780 cm-1 was observed. Polar microregions promote the growth of volume gradually above the Curie temperature ( 170 K), and then freeze around 200 K. From the extrapolation of the temperature dependence of the depolarization ratio, we tried to estimate Burns temperature.

    DOI: 10.1080/00150190802365962

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  • PHYSICAL PROPERTIES OF FERROELECTRIC BI4-xLAxTI3O12 NANO-PARTICLES SYNTHESIZED BY THE CHEMICAL CO-PRECIPITATION METHOD Reviewed

    M. S. Islam, J. Kano, F. Shikanai, S. Kojima

    INTEGRATED FERROELECTRICS   100   146 - 155   2008

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    Bi4 - xLaxTi3O12 (BLT) nano-particles have been synthesised by the chemical co-precipitation method utilizing a polymeric precursor. The particle size decreases from 100 to 40 nm with the increase of La content (x = 0 1) owing to the increase of a reaction temperature. The axial ratio a/b of BLT decreases with the increase of La content reflects a relaxation of structural distortion from its ideal tetragonal structure. A monoclinic to orthorhombic transition occurs at La 0.75. The existence of the soft mode in Raman spectra above x = 0.75 demonstrates a displacive nature of orthorhombic to tetragonal phase transition. No noticeable size effect on physical properties is observed.

    DOI: 10.1080/10584580802540942

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  • Dynamical properties of the relaxor ferroelectric 0.71Pb(Ni1/3Nb2/3)O-3-0.29PbTiO(3) probed by Brillouin and Raman scattering Reviewed

    Shinya Tsukada, Yuji Ike, Jun Kano, Seiji Kojima, Tadashi Sekiya, Yoshiro Shimojo, Ruiping Wang

    IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL   54 ( 12 )   2632 - 2636   2007.12

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    Structural phase transitions in relaxor ferroelectric materials remain to be one of the most puzzling issues in materials science. In the present work, we have investigated relaxational and vibrational properties of a relaxor ferroelectric 0.71Pb(Ni1/3Nb2/3)O-3-0.29PbTiO(3) single crystal by means of inelastic light scattering measurements. Analysis based on the spectra has shown anomalous behaviors at Burns' temperature T-d, freezing temperature T-f those are related to a development of polar nanoregions (PNRs). The PNR must play a key role in the relaxor nature, and obtained results provide new insights into the relaxational dynamics in the PNRs and into how they develop below Tf.

    DOI: 10.1109/TUFFC.2007.590

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  • Raman scattering study of Ca-modified lead titanate Reviewed

    Kihiro Kato, Shinya Tsukada, Jun Kano, Takashi Yamamoto, Seiji Kojima

    IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL   54 ( 12 )   2599 - 2602   2007.12

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    The paraelectric to ferroelectric phase transitions were studied by Raman scattering in Ca-doped lead titanate ceramics. The soft optic modes responsible for the ferroelectric phase transitions were clearly observed. The A(1) (1TO) mode, which softens toward T, contains four subpeaks. The frequencies of these subpeaks depend to a great extent on the Ca content and the temperature. These behaviors are discussed on the basis of the anharmonicity of lattice vibrations.

    DOI: 10.1109/TUFFC.2007.585

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  • Broadband inelastic light scattering study on relaxor ferroelectrics Reviewed

    Shinya Tsukada, Yuji Ike, Jun Kano, Tadashi Sekiya, Yoshiro Shimojo, Ruiping Wang, Seiji Kojimal

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS   46 ( 10B )   7151 - 7154   2007.10

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    Dielectric and light scattering studies on a Pb(Ni1/3Nb2/3)O-3-0.29PbTiO(3) single crystal have been conducted in a wide temperature range to clarify the relaxational properties of polar nanoregions (PNRs). The temperature dependences of the relaxation time observed in light scattering spectra show two characteristic temperatures: associated with enhancement of the correlation length in the PNRs T* and related to a temperature-induced macroscopic structural phase transition Tf. These results are closely related to the behavior of the PNRs. We suggest that two relaxation processes are attributed to the central peak and that the origins of the observed relaxation processes are two types of switching processes of dipole moments in the PNRs. In addition, the activation energy at 0 K has been evaluated as H-0B = 2.11 x 10(3) K.

    DOI: 10.1143/JJAP.46.7151

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  • Characterization of dielectric property of nanosized (Pb0.7Sr0.3)TiO3 powders studied by Raman scattering Reviewed

    Jun Kano, Shinya Tsukada, Fan Zhang, Tomoaki Karaki, Masatoshi Adachi, Seiji Kojima

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS   46 ( 10B )   7148 - 7150   2007.10

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    Nanosized perovskite (Pb0.7Sr0.3)TiO3 powders have been studied by Raman scattering to characterize the dielectric property derived from the particle size effect. All the optical phonons were assigned while referring to previously reported Raman spectra of PbTiO3. The frequencies of the soft E(1TO) and A, (1TO) modes show a slight hardening with a decrease in particle size. The size dependences of the clamped dielectric constants along the a and c axes characterized by the effect of the phonon confinement are evaluated by the Lyddane-Sachs-Teller relation using the observed frequencies of polar modes with E(x, y) and A(1)(z) symmetries, respectively.

    DOI: 10.1143/JJAP.46.7148

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  • Piezoelectric (Na0.5K0.5) NbO3-SrTiO3 ceramics in the tetragonal-orthorhombic phase boundary studied by Raman spectroscopy Reviewed

    Jun Kano, Keita Sasanuma, Shinya Tsukada, Seiji Kojima, Ruiping Wang, Kotaro Hanada, Kunio Matsusaki, Hiroshi Bando

    FERROELECTRICS   347   55 - 59   2007

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    Raman spectroscopy of lead-free piezoelectric (1-x)(Na0.5K0.5)NbO3-xSrTiO(3) ceramics and (Na1-yKy) NbO3 ones sintered by the Spark-Plasma-Sintering method have been performed to investigate the dynamical property in the intermediate phase of x = 0.05. From the comparison of Raman spectra between (1-x)(Na0.5K0.5)NbO3-xSrTiO(3) and (Na1-yKy)NbO3 at room temperature, the overdamped mode which became soften was found in the intermediate phase at x = 0.05. Although it is difficult to assign the mode because of using ceramics samples, this result has a possibility that the overdamped mode includes the soft mode observed in the orthorhombic phase.

    DOI: 10.1080/00150190601187021

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  • Vibrational and dielectric properties of MnO2-doped bismuth layered-structure ferroelectrics Reviewed

    M. S. Islam, J. Kano, Q. R. Yin, S. Kojima

    2007 SIXTEENTH IEEE INTERNATIONAL SYMPOSIUM ON THE APPLICATIONS OF FERROELECTRICS, VOLS 1 AND 2   478 - 480   2007

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    The MnO2 doping effect on ferroelectric phase transitions of CaBi4Ti4O15 ceramics has been studied by Raman scattering, dielectric measurements and scanning electron microscope. The Curie temperatures show monotonic decrease as the content of MnO2 increases. Softeing of low frequency optical modes has been observed for all the compositions, while the Raman scattering decreases markedly as the content of MnO2 increases.

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  • The aging effect in (Bi(0.5)Na(0.5))TiO(3) family with point defects Reviewed

    Y. Hidaka, S. Tsukada, J. Kano, S. Kojima

    2007 SIXTEENTH IEEE INTERNATIONAL SYMPOSIUM ON THE APPLICATIONS OF FERROELECTRICS, VOLS 1 AND 2   305 - 307   2007

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    We have studied the aging effect of bismuth sodium titanate (BNT) ceramics with point defects. With aging BNT ceramics, we have observed slight decrease in BNT permittivity. Permittivity vs. aging time is well reproduced by assumed Debye-relaxation. It is found that there are two relaxation processes in this aging effect. The diffuseness of phase transition is determined from the temperature dependence of permittivity. The diffuseness vs. composition shows the correlation clearly.

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  • &lt;bold&gt;Raman Scattering Study of Ca-Modified Lead Titanate&lt;/bold&gt; Reviewed

    K. Kato, S. Tsukada, J. Kano, T. Yamamoto, S. Kojima

    2007 SIXTEENTH IEEE INTERNATIONAL SYMPOSIUM ON THE APPLICATIONS OF FERROELECTRICS, VOLS 1 AND 2   289 - +   2007

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    We have studied structural and vibrational properties of Ca-doped lead titanate ceramics. The vibrational soft modes associated with the ferroelectric phase transition have been observed. A(1)(1TO) mode, which is one of the soft modes, has four subpeaks due to anharmonicity. Composition and temperature dependences of subpeak frequencies of the A(1)(1TO) mode behaves as expected from theoretical calculation. Some subpeaks remain above the Curie temperature. This is attributed to the point detects and the internal strain.

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  • Dynamical Properties of the Relaxor Ferroelectric 0.71Pb(Ni1/3Nb2/3)O3-0.29PbTiO3 Probed by Brillouin and Raman Scattering Reviewed

    Shinya Tsukada, Yuji Ike, Jun Kano, Tadashi Sekiya, Yoshihito Shimojo, Ruiping Wang, Seiji Kojima

    2007 SIXTEENTH IEEE INTERNATIONAL SYMPOSIUM ON THE APPLICATIONS OF FERROELECTRICS, VOLS 1 AND 2   285 - +   2007

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    Structural phase transitions in relaxor ferroelectric materials remain to be one of the most puzzling issues in solid-state physics. In the present work, we have investigated relaxational and vibrational properties of a relaxor ferroelectric 0.71Pb(Ni1/3Nb2/3)O-3-0.29PbTiO(3) single crystal by means of inelastic light scattering measurements. Analysis based on the spectra has showed anomalous behaviors at Bum's temperature T-d, freezing temperature T-f, those are related to a development of polar nanoregions (PNRs). PNR must play a key role in relaxor nature, and obtained results provide insight into the relaxational processes in the PNR and into how they develop below T-f.

    DOI: 10.1109/ISAF.2007.4393242

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  • Raman scattering study of ca modified lead titanate Reviewed

    S. Tsukada, K. Kato, J. Kano, T. Yamamoto, S. Kojima

    FERROELECTRICS   355   66 - 70   2007

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    The lattice dynamical properties of (Pb(1-x)C(a)x)TiO3 ceramics were investigated by Raman scattering. The low frequency spectra show the strong composition and temperature dependences. The composition dependence of Raman spectra at room temperature is different from the previous work [S.-Y Kuo, C.-T Li and W.-E Hsieh, Phys. Rev. B 69, 184104 (2004).]. This difference is probably attributed to the aging effect of MnO doping. Temperature dependence of Raman spectra of (Pb0.75Ca0.25)TiO3 behaves as expected by the selection rule and the lowest frequency peak softened and broadened as approaching T-c.

    DOI: 10.1080/00150190701515931

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  • Diffuse phase transition of 0.8Pb( Ni1/3Nb2/3)O-3-0.2PbTiO(3) single crystals studied by micro-Brillouin scattering Reviewed

    S. Tsukada, Y. Ike, J. Kano, T. Sekiya, Y. Shimojo, R. Wang, S. Kojima

    FERROELECTRICS   346   37 - 42   2007

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    Brillouin scattering in the relaxor ferroelectric 0.8 Pb(Ni1/3Nb2/3) O-3-0.2 PbTiO3 has been studied in the temperature range from -150 degrees C to 500 degrees C. The anomalies of the frequency shift and full width at half maximum of Brillouin component at the structural phase transition from the paraelectric to ferroelectric phases have been successively detected. The origins of the anomalies of them are discussed from the phenomenological point of view. The central peak caused by the fluctuation of polarization has been also observed in the VV and VH scattering geometries with the large free spectral range of 150 GHz. It is found the difference of central peak intensity obtained in VV and VH scattering geometries.

    DOI: 10.1080/00150190601180182

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  • Investigation on dielectric and piezoelectric properties of (1-x)(Na 0.5K0.5)NbO3-xSrTiO3 ceramics Reviewed

    K. Sasanuma, S. Tsukada, J. Kano, S. Kojima, R. Wang, K. Hanada, K. Matsusaki, H. Bando

    Ferroelectrics   348   106 - 112   2007

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    Lead-free piezoelectric (1-x)(Na0.5K0.5)NbO3-xSrTiO3 ((1-x)NKN- xST) solid solution has been fabricated around a morphotropic phase boundary (MPB) by Spark-Plasma-Sintering method. The phase diagram around MPB was studied by the dielectric measurement. The piezoelectric constant d33 and electromechanical constant kp measurements shows that MPB is about at x = 0.05. Inverse dielectric constants are well fitted by the extended Curie-Weiss law above the Curie temperature and its fitting result shows that the fitting parameters, C and n values show the maxima for 0.95NKN-0.05ST. We suggest the existence of another phase boundary around x = 0.05. To confirm the another phase boundary, the Raman spectra of 0.975NKN-0.025ST and 0.9NKN-0.1ST samples at the tetragonal phases have been measured and comparison has been done.

    DOI: 10.1080/00150190701196237

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  • Broadband inelastic light scattering of a relaxor ferroelectric 0.71Pb(Ni1/3Nb2/3)O-3-0.29PbTiO(3) Reviewed

    Shinya Tsukada, Yuji Ike, Jun Kano, Tadashi Sekiya, Yoshihito Shimojo, Ruiping Wang, Seiji Kojima

    APPLIED PHYSICS LETTERS   89 ( 21 )   2006.11

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    Brillouin and Raman scatterings of a 0.71Pb(Ni1/3Nb2/3)O-3-0.29PbTiO(3) single crystal have been measured to investigate broadband inelastic spectra. The two different central peaks related to fast and slow relaxation processes have been observed separately. These two processes are attributed to the thermally activated switching of polarization in polar nanoregions. By the analysis of modified superparaelectric model, the activation energies of fast and slow relaxation processes are determined to be 3.66x10(3) and 4.31x10(2) K, respectively. The fast process with the lower activation energy probably originated from 180 degrees switching, whereas the slow one with the higher energy from non-180 degrees switching. (c) 2006 American Institute of Physics.

    DOI: 10.1063/1.2393159

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  • Dynamic Property of the Initial Process in the Dielectric Relaxation Phenomenon in KH2PO4

    J. Kano, T. Yagi

    Ferroelectrics   333 ( 1 )   41 - 46   2006.5

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    DOI: 10.1080/00150190600678699

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  • Dynamics of water-ethanol mixtures studied by light scattering Reviewed

    Maii Sato, Yuji Ike, Jun Kano, Seiji Kojima

    FLOW DYNAMICS   832   291 - +   2006

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    Brillouin scattering of water-ethanol binary mixtures have been measured in the temperature range from room temperature to 343 K as a function of ethanol concentration. A maximum appears at 12 ethanol mol% in the sound velocity and at about 50 mol% in the absorption coefficient all at room temperature. Raman scattering of heavy water-ethanol mixtures was also measured at room temperature as a function of concentration. The concentration range from 0100 mol% is divided into three ranges and the behavior of the acoustic properties was discussed with three cluster models; the circular clusters are dominant in the concentration range of 0-12 mol%, layered clusters in the range of 1250 mol%, pure ethanol chain clusters in the range of 50-100 mol% at room temperature. These results are consistent with the concentration variation of OH stretching band of Raman spectra and the results in literatures.

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  • Initial Excitation Process of Ferroelectric B2 Soft Mode in KD2PO4*

    Jun Kano, Yuhji Tsujimi, Keith Nelson, Toshirou Yagi

    Ferroelectrics   308 ( 1 )   17 - 21   2004.1

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    DOI: 10.1080/00150190490508675

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  • Femtosecond Time-Resolved Spectroscopic Study of the Slow Dynamics in the Structural Phase Transition Reviewed

    T. Yagi, J. Kano, T. Watanuki, Y. Tsujimi, K.A. Nelson

    J. Korean. Phys. Soc.   42   S1012 - S1016   2003.4

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  • The Extremely Early Stage of the Ferroelectric B 2 Soft Mode of KDP Studied by the Impulsive Stimulated Raman Scattering

    Jun Kano, Yuhji Tsujimi, Keith A. Nelson, Toshirou Yagi

    Ferroelectrics   285 ( 1 )   59 - 66   2003.1

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    DOI: 10.1080/00150190390205898

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  • Phase Transition Dynamics Studied by Coherent Phonon Excitation with Ultrashort Laser Pulses Reviewed

    Toshirou Yagi, Jun Kano, Tateo Watanuki, Yuhji Tsujimi, Keith A. Nelson

    Ferroelectrics   284 ( 1 )   3 - 13   2003.1

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    DOI: 10.1080/00150190390204240

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  • Initial Process of the Ferroelectric B 2 Soft Mode of KDP Studied by the Impulsive Stimulated Raman Scattering with Heterodyne Detection Reviewed

    Jun Kano, Yuhji Tsujimi, Keith A. Nelson, Toshirou Yagi

    Ferroelectrics   272 ( 1 )   57 - 62   2002.1

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    DOI: 10.1080/713716272

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MISC

  • 金属-酸化物薄膜接合系におけるエネルギーバンドアライメント

    狩野旬, 押目典宏, 廣瀬哲, 上田剛慈, 安井伸太郎, 浜嵜容丞, 伊藤満, 三上仁志, 池田直, 藤井達生, 柏原浩大, SCHNEIDER Julien

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)   80th   2019

  • 電場印加前後でのBaTiO3内殻原軌道のエネルギー準位計測

    押目典宏, 狩野旬, 狩野旬, 池永英司, 安井伸太郎, 日隈聡士, 池田直, 浜嵜容丞, 安原颯, 横谷尚睦, 伊藤満, 藤井達生, 保井晃

    日本物理学会講演概要集(CD-ROM)   73 ( 1 )   2018

  • 強誘電体BaTiO3薄膜の分極反転時における電子構造変化

    押目典宏, 狩野旬, 池永英司, 安井伸太郎, 日隈聡士, 池田直, 浜嵜容丞, 安原颯, 横谷尚睦, 伊藤満, 藤井達生, 保井晃, 大沢仁志

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)   79th   2018

  • 分極効果で変調される強誘電体BaTiO3薄膜の電子構造

    押目典宏, 狩野旬, 狩野旬, 池永英司, 安井伸太郎, 日隈聡士, 池田直, 浜嵜容丞, 安原颯, 横谷尚睦, 伊藤満, 藤井達生, 保井晃

    応用物理学会春季学術講演会講演予稿集(CD-ROM)   65th   2018

  • 分極効果で変調される強誘電体BaTiO3薄膜の電子構造

    押目典宏, 狩野旬, 狩野旬, 池永英司, 安井伸太郎, 日隈聡士, 池田直, 浜嵜容丞, 安原颯, 横谷尚睦, 伊藤満, 藤井達生, 保井晃

    日本セラミックス協会年会講演予稿集(CD-ROM)   2018   2018

  • Direct observation of band bending structure on ferroelectric BaTiO3

    Oshime N, Kano J, Ikenaga E, Yasui S, Hinokuma S, Ikeda N, Yokoya T, Fujii T

    Meeting Abstracts of the Physical Society of Japan   72 ( 0 )   2725 - 2725   2017

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    &lt;p&gt;自発分極は試料内部の静電ポテンシャルを傾斜させる。強誘電体の原子軌道エネルギーはこの傾斜に応じて系統的に変化すると考えられる。この現象はバンドベンディングと呼ばれ40年以上に渡り予想されてきた。今回,BaTiO_3_においてバンドベンディング現象を直接的に観測したので報告する。本研究において得られた実験結果は,エピタキシャル製膜された強誘電体薄膜試料と深さ分解光電子分光実験を組み合わせることで初めて達成できた。&lt;/p&gt;

    DOI: 10.11316/jpsgaiyo.72.1.0_2725

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  • BaTiO3のバンドベンディング構造

    押目典宏, 狩野旬, 狩野旬, 池永英司, 安井伸太郎, 日隈聡士, 池田直, 浜嵜容丞, 安原颯, 横谷尚睦, 伊藤満, 藤井達生, 保井晃

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)   78th   2017

  • 分極効果で変調される強誘電体BaTiO3の電子構造

    押目典宏, 狩野旬, 狩野旬, 池永英司, 安井伸太郎, 日隈聡士, 池田直, 浜嵜容丞, 安原颯, 横谷尚睦, 伊藤満, 藤井達生, 保井晃

    日本物理学会講演概要集(CD-ROM)   72 ( 2 )   2017

  • Mnをドープした(YbFe2O4)m(YbFeO3)n,m=1,n=1単結晶の磁性と誘電特性

    烏谷友之, 藤原孝将, 藤井達生, 戸取和大, 古林宏之, 福永守, 堀部陽一, 狩野旬, 狩野旬, 池田直

    日本物理学会講演概要集(CD-ROM)   71 ( 1 )   2016

  • 化学当量性の良いYbFe2O4の電荷秩序と誘電性 1

    藤原孝将, 宮島瑞樹, 烏谷友之, 福永守, 古林宏之, 永田知子, 狩野旬, 狩野旬, 池田直

    日本物理学会講演概要集(CD-ROM)   70 ( 2 )   2015

  • Preparation and Electronic Properties YbFe2O4 Thin Films by Polymerized Complex Method

    N. Okamura, T. Fujii, J. Takada, M. Nakanishi, J. Kano, N. Ikeda

    Ferrites: Proceedings of ICF 11   S327-S329   2014

  • 走査型放射光顕微鏡で見る強相関電子系物質のドメイン構造

    竹下聡史, 大隅寛幸, 有馬孝尚, 有馬孝尚, 高田昌樹, 高田昌樹, 赤浜裕士, 神戸高志, 狩野旬, 永田知子, 池田直, 湯本博勝, 小山貴久, 大橋治彦, 大橋治彦

    日本放射光学会年会・放射光科学合同シンポジウム予稿集   25th   2012

  • 22pGK-6 Dielectric properties of LuFe_2O_4 under magnetic fields

    Fukada Y., Kambe T., Nagata T., Kano J., Ikeda N.

    Meeting abstracts of the Physical Society of Japan   66 ( 2 )   542 - 542   2011.8

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  • 22pGK-8 Electrical conduction mechanism of electronic ferroelectric RFe_2O_4

    Nagata T., Fukada Y., Akahama H., Funae T., Okazaki H., Yokoya T., Kambe T., Kano J, Ikeda N.

    Meeting abstracts of the Physical Society of Japan   66 ( 2 )   542 - 542   2011.8

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  • 22pGK-5 Calorimetric Property of Stacked Triangular Mixes Iron Valence Oxide LuFe_2O_4

    Kano J., Kambe T., Fukada Y., Nagata T., Ikeda N.

    Meeting abstracts of the Physical Society of Japan   66 ( 2 )   541 - 541   2011.8

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  • 23aPS-131 Low Frequency Micro-Raman Scattering in LuFe_2O_4

    Mitsumura T., Takesada M., Fukada Y., Nagata N., Kano J., Ikeda N., Onodera A.

    Meeting abstracts of the Physical Society of Japan   66 ( 2 )   1005 - 1005   2011.8

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  • 26aPS-118 Low Frequency Light Scattering in LuFe_2O_4

    Mitsumura T., Takesada M., Akahama Y., Kambe T., Kano J., Nagata T., Ikeda N., Onodera A.

    Meeting abstracts of the Physical Society of Japan   66 ( 1 )   971 - 971   2011.3

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  • 27pTM-4 Effects of Yb or Fe site substitution of YbFe_2O_4

    Nagata T., Funae T., Nakanishi A., Kano J., Kambe T., Okazaki H., Muraoka Y., Yokoya T.

    Meeting abstracts of the Physical Society of Japan   66 ( 1 )   982 - 982   2011.3

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  • 集光放射光で見たLuFe2O4の電荷秩序ドメイン

    竹下聡史, 大隅寛幸, 有馬孝尚, 有馬孝尚, 高田昌樹, 赤浜裕士, 神戸高志, 狩野旬, 永田知子, 池田直, 湯本博勝, 小山貴久, 大橋治彦

    日本物理学会講演概要集   66 ( 1 )   2011

  • 26aYJ-8 Metal nanoclusters on ferroelectric oxides studied by HRTEM

    Kano Jun, Kizuka Tokushi, Kojima Seiji

    Meeting abstracts of the Physical Society of Japan   64 ( 2 )   866 - 866   2009.8

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  • 23pYE-5 Broadband Light Scattering Study on Pb(Ni_<1/3>Nb_<2/3>)O_3-0.29PbTiO_3 and Pb(Zn_<1/3>Nb_<2/3>)O_3-0.07PbTiO_3 Single Crystals

    Tsukada S., Ike Y., Kano J., Sekiya T., Shimojo Y., W. Ruiping, Kojima S.

    Meeting abstracts of the Physical Society of Japan   63 ( 1 )   916 - 916   2008.2

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  • 2-01-01 Polar Nanoregions in Relaxor Ferroelectrics by Micro-Brillouin Spectroscopy(Ultrasonic properties of materials, Phonon physics)

    Tsukada Shinya, Ike Yuji, Kano Jun, Sekiya Tadashi, Shimojo Yoshiro, Wang Ruiping, Kojima Seiji

    Proceedings of Symposium on Ultrasonic Electronics   28   175 - 176   2007.11

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  • Acoustic Properties of Relaxor Ferroelectric Pb(Ni_<1/3>Nb_<2/3>)O_3-0.29PbTiO_3

    TSUKADA Shinya, IKE Yuji, KANO Jun, SEKIYA Tadashi, SHIMOJO Yoshiro, WANG Ruiping, KOJIMA Seiji

    IEICE technical report   107 ( 283 )   9 - 12   2007.10

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    Acoustic properties of a relaxor ferroelectric Pb(Ni_<1/3>Nb_<2/3>)O_3-0.29PbTiO_3 single crystal have been studied by Miro-Brillouin scattering to manifest the mechanism of the diffuse phase transition. These temperature dependences show anomalies at three characteristic temperatures : at Burns temperature T_d related to the formation of the PNRs, at T^* associated with the growth of the PNRs, and at freezing temperature T_f related to the temperature-induced macroscopic structural phase transition, which are closely related to the dynamical behavior of the PNRs.

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  • 24aTE-6 Broadband Light Scattering Study on the Relaxor Ferroelectric Pb(Ni_<1/3>Nb_<2/3>)O_3-0.29PbTiO_3 Single Crystal

    Tsukada S., Ike Y., Kano J., Sekiya T., Shimojo Y., Ruiping W., Kojima S.

    Meeting abstracts of the Physical Society of Japan   62 ( 2 )   1015 - 1015   2007.8

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  • P2-3 Brillouin Scattering Spectroscopy on α-β Phase Transition of Quartz Using an Angular Dispersion-Type Fabry-Perot Interferometer(Short oral presentation for posters)

    Tsukada Shinya, Ike Yuji, Kano Jun, Kojima Seiji

    Proceedings of Symposium on Ultrasonic Electronics   26   217 - 218   2005.11

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Presentations

  • Single domain growth and charge ordering of epitaxial YbFe2O4 films

    Takumi Sakagami, Reika Ota, Jun Kano, Naoshi Ikeda, Tatsuo Fujii

    CRYSTENGCOMM  2021.8  ROYAL SOC CHEMISTRY

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    Event date: 2021.8

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    YbFe<INF>2</INF>O<INF>4</INF> is a charge-ordered ferroelectric that exhibits coupling between magnetization and electric polarization near room temperature and crystallizes in a rhombohedral structure (R3m). This study presents an attempt to fabricate stoichiometric and epitaxial YbFe<INF>2</INF>O<INF>4-delta</INF> films with a nearly single-domain structure using an RF magnetron sputtering method. The (0001)-oriented epitaxial films of YbFe<INF>2</INF>O<INF>4-delta</INF> on YSZ (111) substrates via reactive sputtering method exhibited clear three-fold symmetry normal to the substrate without the formation of twin domains rotated by 60 degrees. The oxygen stoichiometry of the epitaxial YbFe<INF>2</INF>O<INF>4-delta</INF> was improved by controlling an oxygen partial pressure (P<INF>O<INF>2</INF></INF>) during the deposition. The films showed a sharp ferrimagnetic transition, and the transition temperature (T<INF>N</INF>) increased linearly to approximately 245 K with decreasing P<INF>O<INF>2</INF></INF>. The magnitude of magnetization of the obtained films was comparable to that of bulk single crystals. Further, the electron diffraction pattern of the stoichiometric films confirmed the presence of three-dimensional charge order, which is consistent with the behavior of the bulk crystals as well.

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  • 酸化物に接合された金属薄膜への分子吸着挙動

    狩野旬, 押目典宏, 廣瀬哲, 上田剛慈, 安井伸太郎, 浜嵜容丞, 伊藤満, 三上仁志, 池田直, 藤井達生, 柏原浩大, SCHNEIDER Julien

    日本物理学会講演概要集(CD-ROM)  2019 

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  • Core-level binding-energy of BaTiO<sub>3</sub> with pre- and post-application of electric field

    Oshime N., Itoh M., Fujii T., Yasui A., Kano J., Ikenaga E., Yasui S., Hinokuma S., Ikeda N., Hamasaki Y., Yasuhara S., Yokoya T.

    Meeting Abstracts of the Physical Society of Japan  2018  The Physical Society of Japan

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  • Electronic states modulated by electric polarization in ferroelectric BaTiO<sub>3</sub>

    Oshime N., Itoh M., Fujii T., Yasui A., Kano J., Ikenaga E., Yasui S., Hinokuma S., Ikeda N., Hamasaki Y., Yasuhara S., Yokoya T.

    Meeting Abstracts of the Physical Society of Japan  2017  The Physical Society of Japan

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  • Quantitative study of band structure in iron oxides

    Oshime N., Kano J., Okamoto T., Ikeda N., fujii T.

    Meeting Abstracts of the Physical Society of Japan  2016  The Physical Society of Japan

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  • Dielectric property of Mn doped Yb<sub>2</sub>Fe<sub>3</sub>O<sub>7</sub> single crystal

    Karasudani T., Fujiwara K., Fujii T., Todori K., Fukunaga M., Horibe Y., Kano J., Ikeda N.

    Meeting Abstracts of the Physical Society of Japan  2016  The Physical Society of Japan

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  • 22pCH-13 Catalysis in metal-ferroelectric junctions

    Kano J., Ikeda N., Oshime N., Fujii T., Hashimoto H., Teranishi T., Ohkubo T., Ueda T., Yoshida T., Akiyama Y.

    Meeting Abstracts of the Physical Society of Japan  2015  The Physical Society of Japan (JPS)

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  • 22aCH-4 dielectric and the charge ordered structure changes by iron ion content of YbFe_2O_4

    Fujiwara Kosuke, Miyajima Mizuki, Fukunaga Mamoru, kano Jun, Nagata Tomoko, kambe Takashi, Ikeda Naoshi

    Meeting Abstracts of the Physical Society of Japan  2015  The Physical Society of Japan (JPS)

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  • 21pCJ-7 Mg-doping effects in Ba_<0.8>Sr_<0.2>TiO_3

    Oshime N., Kano J., Osaki K., Teranishi T., Yoshida T., Ikeda N., Fujii T., Ohkubo T., Ueda T.

    Meeting Abstracts of the Physical Society of Japan  2015  The Physical Society of Japan (JPS)

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  • 7aPS-10 Semiconductor and Dielectric Properties of RFe_2O_4

    Fujiwara Kosuke, Miyajima Mizuki, Nagata Tomoko, Fukunaga Mamoru, Kambe Takashi, kano Jun, Ikeda Naoshi

    Meeting abstracts of the Physical Society of Japan  2014.8.22  The Physical Society of Japan (JPS)

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  • 8pAF-11 Band structure and post-annealing treatment of BaTiO_3

    Oshime N., Kano J., Fujii T, Ikeda N.

    Meeting abstracts of the Physical Society of Japan  2014.8.22  The Physical Society of Japan (JPS)

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  • Phase transition of mixed valence layered iron oxide, YbFe_2O_4 II

    Nagata T., Kano J., Fukunaga M., Kambe T., Roman B., Feyerherm R., Dudzik E., Janolin P.E., Kiat J.M., Hasegawa N., Takesada M., Onodera A., Ikeda N.

    Meeting abstracts of the Physical Society of Japan  2013.8.26  The Physical Society of Japan (JPS)

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  • Relation of the band gap and chemical equivalent of Ba_<1-x>Sr_xTiO_3

    Oshime N., Kano J., Ikeda N.

    Meeting abstracts of the Physical Society of Japan  2013.8.26  The Physical Society of Japan (JPS)

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  • 28pXS-1 Symmetry study of mixed valence layered iron oxide, YbFe_2O_4

    Nagata T., Fukada Y., Kawai M., Kano J., Fukunaga M., Kambe T., Guiblin N., Feyerherm R., Dudzik E., Janolin P. E., Kiat J. M., Ikeda N.

    Meeting abstracts of the Physical Society of Japan  2013.3.26  The Physical Society of Japan (JPS)

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  • 27pXZB-11 Electric state of Fe oxide nano-particles on BaTiO_3,ZrO_2

    Okamoto T., Kano J., Nakamura S., Fuwa A., Otoyama T., Nakazaki Y., Hashimoto H., Takada J., Oshime N., Ito M., Ikeda N.

    Meeting abstracts of the Physical Society of Japan  2013.3.26  The Physical Society of Japan (JPS)

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  • 28pXS-2 Magnetoelectric response of LuFe_2O_4 by using impedance analysis

    Fukada Y., Nagata T., Kawai M., Ejiri H., Fukunaga M., kano J., Kambe T., Ikeda N.

    Meeting abstracts of the Physical Society of Japan  2013.3.26  The Physical Society of Japan (JPS)

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  • 27aXS-10 Semiconductor Property of RFe_2O_4(II)

    Kawai Masahiro, Ejiri Hiroki, Okamura Naoya, Fukada Yukimasa, Nagata Tomoko, Kano Jun, Kambe Takashi, Ikeda Naoshi

    Meeting abstracts of the Physical Society of Japan  2013.3.26  The Physical Society of Japan (JPS)

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  • 18pGB-8 Phase transition of mixed valence layered iron oxide, YbFe_2O_4

    Nagata T., Fukada Y., Kano J., Fukunaga M., Kambe T., Roman B., Boemare G., Feyerherm R., Dudzik E., Janolin P. E., Kiat J. M., Ikeda N.

    Meeting abstracts of the Physical Society of Japan  2012.8.24  The Physical Society of Japan (JPS)

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  • 18pGB-9 Impedance dependence on the electrode on LuFe_2O_4

    Fukada Y., Nagata T., Kawai M., Ejiri H., Fukunaga M., Kano J., Kambe T., Ikeda N.

    Meeting abstracts of the Physical Society of Japan  2012.8.24  The Physical Society of Japan (JPS)

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  • 24aYF-3 Anisotropy of Nonlinear Electric Conduction in YbFe_2O_4

    Nagata T., Fukada Y., Kawai M., Kano J., Kambe T., Ikeda N.

    Meeting abstracts of the Physical Society of Japan  2012.3.5  The Physical Society of Japan (JPS)

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  • 24aYF-4 Anisotropy of Dielectric Constant on LuFe_2O_4 under Magnetic Field

    Fukada Y., Nagata T., Kano J., Kambe T., Ikeda N., Kawai M.

    Meeting abstracts of the Physical Society of Japan  2012.3.5  The Physical Society of Japan (JPS)

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  • 25aPS-108 Semiconductor Property of R_<1-x>M_xFe_2O_4

    Kawai M., Nagata T., Fukada Y., Kano J., Kambe T., Ikeda N.

    Meeting abstracts of the Physical Society of Japan  2012.3.5  The Physical Society of Japan (JPS)

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Industrial property rights

  • 電磁波吸収材料及び電磁波吸収樹脂成型体

    古林 宏之, 森 正和, 池田 直, 狩野 旬

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    Applicant:三恵技研工業株式会社

    Application no:特願2019-182052  Date applied:2019.10.2

    Announcement no:特開2021-057545  Date announced:2021.4.8

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  • 電気熱量材料の特性評価装置、その方法、及びそのプログラム

    井口 亮, 内田 健一, 狩野 旬, 寺西 貴志

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    Applicant:国立研究開発法人物質・材料研究機構

    Application no:特願2019-136550  Date applied:2019.7.25

    Announcement no:特開2021-021578  Date announced:2021.2.18

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  • 炭素ナノ構造体の生成方法及び炭素ナノ構造体

    池田 直, 仁科 勇太, 狩野 旬, 青柳 佑海人, 藤原 孝将, 森 正和

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    Applicant:国立大学法人 岡山大学

    Application no:特願2018-222786  Date applied:2018.11.28

    Announcement no:特開2019-099989  Date announced:2019.6.24

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  • 炭素繊維三次元構造体及びその製造方法

    森 正和, 池田 直, 狩野 旬

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    Applicant:学校法人 龍谷大学

    Application no:特願2017-059075  Date applied:2017.3.24

    Announcement no:特開2018-161766  Date announced:2018.10.18

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  • 3次元繊維構造体

    朴 載赫, 明渡 純, 池田 直, 狩野 旬

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    Applicant:国立研究開発法人産業技術総合研究所

    Application no:特願2013-122402  Date applied:2013.6.11

    Announcement no:特開2014-240123  Date announced:2014.12.25

    Patent/Registration no:特許第6206905号  Date registered:2017.9.15 

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  • エタノール分解反応用触媒

    狩野 旬, 池田 直, 太田 美穗, 三津井 知宏, 中島 昭, 小松 通郎

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    Applicant:国立大学法人 岡山大学

    Application no:特願2013-035963  Date applied:2013.2.26

    Announcement no:特開2014-161811  Date announced:2014.9.8

    Patent/Registration no:特許第6269912号  Date registered:2018.1.12 

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  • 鉄系産業廃棄物から生成される鋳鉄用原料、鋳鉄用原料の製法、鋳鉄、鋳鉄の製法及び鋳鉄原料用製造キット

    池田 直, 狩野 旬, 上田 博之, 宮地 豊, 松島 守

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    Applicant:株式会社ユーテック

    Application no:特願2011-169118  Date applied:2011.8.2

    Announcement no:特開2013-032567  Date announced:2013.2.14

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  • 触媒及びその製造方法

    狩野 旬, 池田 直, 三宅 通博

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    Applicant:国立大学法人 岡山大学

    Application no:特願2011-024667  Date applied:2011.2.8

    Announcement no:特開2012-161751  Date announced:2012.8.30

    Patent/Registration no:特許第5804489号  Date registered:2015.9.11 

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  • 誘電体化合物薄膜及びその製造方法

    藤井 達生, 高田 潤, 池田 直, 狩野 旬, 中西 真

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    Applicant:国立大学法人 岡山大学

    Application no:特願2011-002596  Date applied:2011.1.10

    Announcement no:特開2012-144390  Date announced:2012.8.2

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  • クリップ

    狩野 明男, 石田 誠, 掛川 旬

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    Applicant:株式会社 アパートメント

    Application no:特願2009-261742  Date applied:2009.11.17

    Announcement no:特開2011-033184  Date announced:2011.2.17

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  • 触媒金属析出方法および触媒金属担持体粒子

    狩野 旬, 小島 誠治, 木塚 徳志, 鹿内 文仁

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    Applicant:国立大学法人 筑波大学

    Application no:特願2008-052685  Date applied:2008.3.3

    Announcement no:特開2009-207977  Date announced:2009.9.17

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  • 触媒製造方法および触媒

    狩野 旬, 小島 誠治, 木塚 徳志, 鹿内 文仁

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    Applicant:国立大学法人 岡山大学

    Application no:特願2008-052689  Date applied:2008.3.3

    Announcement no:特開2009-207979  Date announced:2009.9.17

    Patent/Registration no:特許第5460969号  Date registered:2014.1.24 

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  • 触媒金属担持強誘電体製造方法および触媒金属担持強誘電体

    狩野 旬, 小島 誠治, 木塚 徳志, 鹿内 文仁

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    Applicant:国立大学法人 筑波大学

    Application no:特願2008-052686  Date applied:2008.3.3

    Announcement no:特開2009-207978  Date announced:2009.9.17

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Research Projects

  • Morphology control of silver dendrites grown under light and study of their optical functions

    Grant number:23H01881  2023.04 - 2026.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    武安 伸幸, 紀和 利彦, 庄司 暁, 大久保 貴広, 狩野 旬

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    Grant amount:\18330000 ( Direct expense: \14100000 、 Indirect expense:\4230000 )

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  • Understanding the Mechanism of Soil Particle Aggregation Enhancement by Natural Latex and its Application to Soil Erosion Control Technology

    Grant number:22K19224  2022.06 - 2025.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Research (Exploratory)  Grant-in-Aid for Challenging Research (Exploratory)

    宗村 広昭, 狩野 旬, 森 也寸志

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    Grant amount:\6370000 ( Direct expense: \4900000 、 Indirect expense:\1470000 )

    圃場から水域への土壌流亡(炭素流亡)は世界的環境問題であり過去60年以上の研究蓄積にも拘わらず未解決である.本研究は天然ゴムラテックス(以下,天然ラテックス)の特性・利点(高い凝集能,カーボンニュートラルなど)を生かし問題解決に挑戦する.現状では天然ラテックスによる土壌流出特性や土壌環境変化とそれらの制御に関する研究は殆どない.研究チームは,水文学,土壌物理学,固体化学を専門とし,天然ラテックスによる土壌物理化学特性変化や土壌流亡抑制(炭素貯留)効果を評価する.
    令和4年度はタイ2圃場から採取された土壌(Sandy loam,Red clay)とタイ産の天然ラテックスを用いて実験を実施した.輸入した土壌量が限られるため小型の実験装置を構築した.構築した実験装置を用いて,降雨強度20㎜/hと50mm/hの条件下において,表面流出量と浸透量を計測し,天然ラテックス混和の有無および土壌種類の違いによる影響を評価した.その際,時間経過による影響も評価するため,24時間経過後に同一実験を繰り返した.
    その結果,降雨強度20mm/hの場合,天然ラテックスを土壌に混和することで,表面流出量が減少し,浸透量が増加する傾向が伺えた.特に,Sandy loamでその傾向が顕著に観測された.また24時間経過後に実施した実験においても同様の傾向であった.一方,降雨強度50mm/hの場合では,表面流出量の方が浸透量よりも顕著に大きく,天然ラテックス混和の有無による差異は小さいことが分かった.

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  • Cellar differentiation on the electronic semiconductor device induced by the electric stimulation

    Grant number:22K18976  2022.06 - 2024.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Research (Exploratory)  Grant-in-Aid for Challenging Research (Exploratory)

    狩野 旬, 山本 泰生, 竹田 哲也, 守屋 央朗

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    Grant amount:\6500000 ( Direct expense: \5000000 、 Indirect expense:\1500000 )

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  • 電気分極由来の傾斜したバンド構造により発現する強誘電体の半導体物性

    Grant number:20KK0330  2021 - 2023

    日本学術振興会  科学研究費助成事業 国際共同研究加速基金(国際共同研究強化(A))  国際共同研究加速基金(国際共同研究強化(A))

    狩野 旬

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    Grant amount:\14040000 ( Direct expense: \10800000 、 Indirect expense:\3240000 )

    我々は先に,強誘電体BaTiO3薄膜に対し放射光光源を用いた角度分解光電子分光実験を行い,これまで未知であった傾斜したバンド構造を観測することに成功している。しかし,強誘電体の特異な電子構造は明らかになったばかりであり,強誘電性半導体を用いた電子デバイスの完全設計には至っていない。そこで本研究では,① 傾斜したバンド構造からの電気分極形成機構を解明し,②新しいフェロイックデバイス設計の指針となる,強誘電性半導体物性の解明に取り組む。
    初年度は,誘電性と磁性が共存するマルチフェロック物質においても,電気分極由来の傾斜したバンド構造が存在するのか?および従来型強誘電体に磁性イオンをドープさせることで磁性イオンが強誘電体結晶中でどのように振る舞うのか?の2点に着目して研究を行った。その結果,マルチフェロック物質BiFeO3において放射光源を用いた硬X線角度分解光電子分光法(AR-HAXPES)により,電気分極由来の傾斜バンド構造を初めて観測することに成功した。また,代表的な強誘電体BaTiO3に極低濃度の鉄イオンをドープさせた試料を合成し,その磁性およびバンド構造を明らかにすることができた。前者の成果については2022年6月の国際会議,後者は7月に仏共同研究グループに所属する博士論文公聴会にて発表される。
    このように研究成果は順調に出ているが,研究代表者が仏へ滞在し在外研究を行うことが未だできていない。理由はコロナによる海外渡航の制限によるもので,遅れながら2022年春には渡航を予定していたがウクライナ情勢もあること,仏共同研究グループの博士課程学生の研究を優先させために遅れが生じている。そのため日本で行う実験を前倒しして行い,その分の成果は出ているので研究内容に遅れはない。

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  • 熱イメージングを用いた誘電体における熱電現象・電場誘起熱応答の開拓

    Grant number:20H02609  2020.04 - 2023.03

    日本学術振興会  科学研究費助成事業 基盤研究(B)  基盤研究(B)

    井口 亮, 寺西 貴志, 狩野 旬, 内田 健一

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    Grant amount:\18200000 ( Direct expense: \14000000 、 Indirect expense:\4200000 )

    本研究は、誘電体において電場が誘起する熱現象を詳らかにし、誘電体の熱制御の方法や熱応答の理解の刷新を狙うものである。本年度は、サーモグラフィ法を用いて誘電体における縦熱電効果(電場と熱流方向が平行)の温度依存性および物質依存性の計測、そしてその定量化を目指した取り組みを行った。特に、交流サーモグラフィ計測における定量性の確保のため、評価・実験面での取り組みに力を入れた。実験結果の議論を行うためには、交流熱応答から適切な物理量を定量的に抽出する必要があり、既知の電気熱量効果をモデルとして評価法の構築に取り組んだ。熱リークや電気熱量効果そのものの周波数依存性を取り入れた評価法を検討した結果、赤外線カメラ自体の応答の補正も組み入れる必要性が分かった。これに対応した交流サーモグラフィ計測評価法を完成させ、電気熱量効果を対象として論文として公表する準備を進めた。実験面では、誘電体試料の電極および配線の間の接触状態によって、対象とする効果の温度変化量が変わる懸念があり、サーモグラフィ計測および高電圧印加と両立するプロービングシステムを設計し、準備を進めた。また、計画していた異種誘電体接合系における実験も進めた。電気的特性および機械的特性は問題なく、今後詳細な熱測定と解析を進める予定である。加えて、新たに物質依存性測定の一環として開始した単結晶試料を用いた実験においても進展があった。その熱信号は非自明な空間分布を有しており、縦熱電効果において誘電秩序の果たす想定外の役割がある可能性がある。これを明らかにすべく、可視光用の測定系をサーモグラフィと組み合わせた赤外-可視同時計測にも取り組んだ。

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  • Skewed electronic band structure of ferroelectric oxide induced by the electric polarization

    Grant number:19K05271  2019.04 - 2022.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    Kano Jun

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    Grant amount:\4290000 ( Direct expense: \3300000 、 Indirect expense:\990000 )

    Angle-resolved hard x-ray photoemission spectroscopy (AR-HAXPES) has been performed on a skewed electronic structure in ferroelectric thin films. The slope of the skewed band could be changed by switching the polarization. In our experiment, an electronic structure skewed by the electric polarization of ferroelectric is revealed by the binding energy shift of atomic orbitals. All atomic orbitals show similar behaviors, but the magnitude of the energy shift is different. We attributed the electric polarization in the ion crystal to the atomic contribution. Born effective charges, which are different from nominal ionic charges, are defined by the actual amplitude of the polarization divided by the ionic displacement. We found that the magnitude of the energy shift of each atomic orbital has a good correlation with the Born effective charge. These findings lead to a better understanding of the origin of electric polarization.

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  • Fabrication of room-temperature multiferroic materials by rare-earth iron oxide system with triangular lattices

    Grant number:18H02057  2018.04 - 2022.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    FUJII Tatsuo

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    Grant amount:\17550000 ( Direct expense: \13500000 、 Indirect expense:\4050000 )

    RFe2O4 is expected as a next-generation multiferroic material. We attempted to synthesize its single-crystalline film by the sputtering method. As a result, the in-plane orientation of the RFe2O4 layer on the sapphire substrate rotates 30 ° depending on the presence of the Fe3O4 buffer layer. When Fe3O4 and RFe2O4 are laminated to form a multilayer film, the in-plane orientation also depends on their stacking order. In addition, when using the YSZ single crystal substrate, we succeeded in obtaining an RFe2O4 thin film that does not have twin domains and is almost completely composed of single domains.

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  • Induced magnetization on non-magnetic nanoparticles by surface structural relaxations

    Grant number:26630319  2014.04 - 2017.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research  Grant-in-Aid for Challenging Exploratory Research

    FUJII Tatsuo, TAKEMURA Daiki, ANDOU Daiki

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    Grant amount:\3900000 ( Direct expense: \3000000 、 Indirect expense:\900000 )

    In recent years, applications of magnetic nanoparticles in various fields are expected. We found that LaFeO3 nanoparticles having almost no magnetization in bulk form showed large magnetization at low temperatures. Therefore, it should be worth to clarify the mechanism of the induced magnetization systematically to evaluate the relationship between the crystal structure and magnetic properties of LaFeO3 nanoparticles. As a first step, we tried to prepare LaFeO3 nanoparticles with a uniform particle size distribution by using salt-assisted spray pyrolysis. The salt-assisted spray pyrolysis has been expected to synthesize complex oxide nanoparticles with single nanometric sizes.

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  • Novel catalysis assisted by ferroelectric charge fluctuation

    Grant number:24654089  2012.04 - 2014.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research  Grant-in-Aid for Challenging Exploratory Research

    KANO Jun, KANO Jun, HASHIMOTO Hideki

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    Grant amount:\3770000 ( Direct expense: \2900000 、 Indirect expense:\870000 )

    For the development of novel catalyst, the route to the optimum solution is through experiments. Here we propose the novel functional catalyst using ferroelectrics based on the semiconducting property and the coherent ferroelectric fluctuation.

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  • ガラスのスローダイナミクスにおけるモード結合理論の定量的解釈

    Grant number:17740274  2005 - 2006

    日本学術振興会  科学研究費助成事業 若手研究(B)  若手研究(B)

    狩野 旬

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    Grant amount:\3400000 ( Direct expense: \3400000 )

    液体ガラス転移のダイナミクスの本質が理解されていないのは、その巨視的性質が実に様々なスケールを持つ運動過程により支配されているためである。平成17年度、比熱測定・周波数領域での誘電測定・光散乱実験では充分観測できなかった複雑液体中でのミクロな動的機構を、フェムト秒パルスレーザーを用いた光カー効果(OKE)を利用したコヒーレントフォノン励起法を用いることで直接時間領域での観測できるシステムの構築を試みた。OKEにヘテロダイン検波システムを取り入れたOHD-OKEシステムを立ち上げを行い、液体中のミクロなゆらぎを観測する事に成功した。平成18年度においては液体ガラス転移を示す系のひとつである水・エタノール二成分混合系に注目した。水・エタノールにおいてはまず低振動領域に現れる揺らぎを前年度にOKEにて観測したが、二成分混合系においては水・エタノール間にできる複雑な水素結合のネットワークが重要と考え特に水素結合間の揺らぎに注目した。そこで低振動領域(長時間領域)とは対照的に高振動数領域(短時間領域)に観測される水素-酸素(OH)結合の揺らぎはラマン散乱実験によって観測した。なおOH結合の揺らぎを他の内部振動モードから分離するために重水素置換した重水溶液にて行った。その結果、OH結合の揺らぎには特徴的な水・エタノール濃度依存性がある事がわかった。エタノール低濃度側においては、水・エタノール分子間をつなぐ水和シェル構造が堅固に構成されており、その構造は濃度によらず支配的である。一方、エタノール濃度が増していくと水・エタノール分子間をつなぐ水素結合のネットワークは連続的に変化していった。さらに永和シェル構造などミクロな領域で形成されるクラスターの大きさはエタノールよりアルキル基の多いブタノールなどに比べ小さい事も見積もられた。過冷却状態下で低振動領域に現れる揺らぎの詳細を明らかにすることでモード結合理論の定量的解析をするまでにはまだ至っていないが、今回ミクロな描像が明らかになった水・エタノール二成分混合系を対象に研究を進めていく計画である。

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Media Coverage

  • 強誘電体の電気分極に由来 傾斜したバンド構造を観測 Newspaper, magazine

    科学新聞  1面  2020.7.17

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