研究者詳細 - 岸本　昭

論文 - 岸本　昭

分割表示 211 件中 1 - 20 件目／全件表示 >>

Temporary reinforcement of proton-conductive ceramics by introducing a graded carrier 査読

Takaya Ueno, Wakuya Miyamoto, Shinya Kondo, Takashi Teranishi, Akira Kishimoto

Materials Science and Engineering: B 321 ( 11 ) 118499 - 118499 2025年11月

Fabrication of Mullite Based Porous Ceramics with Favorable Creep Resistance Utilizing Superplastically Foaming Method 査読

Ryotaro Yokota, Sakiho Arizuka, Wakuya Miyamoto, Shinya Kondo, Takashi Teranishi, Akira Kishimoto

Journal of the Japan Society of Powder and Powder Metallurgy 72 ( Supplement ) S761 - S766 2025年3月

Permittivity and remanent polarization contributions to the electrocaloric effect in (Ba, Sr)TiO3 under unipolar field 査読

Yukiya Tanaka, Ryo Iguchi, Takashi Teranishi, Shinya Kondo, Akira Kishimoto

Applied Physics Letters 126 ( 13 ) 2025年3月

担当区分：最終著者掲載種別：研究論文（学術雑誌）出版者・発行元：AIP Publishing

The electrocaloric effect (ECE)-induced temperature change (ΔT) in (Ba, Sr)TiO3-based ferroelectrics under unipolar electric fields was analyzed from the separate contributions of the dielectric constant (ε) and remanent polarization (Pr) based on the Maxwell relation. Consideration of the contributions of both ε and Pr is particularly important in a unipolar electric field operation, such as on/off field switching used in device applications. Direct ΔT measurements were also performed based on the lock-in thermography technique to verify the accuracy of the ΔT intensity estimated by the indirect method. The indirect and direct ΔT values were largely consistent. The ΔT intensity near the peak temperature of ΔT was dominated by the Pr contribution; a large ∂Pr/∂T was necessary to increase the overall ΔT magnitude. In contrast, a large ∂ε/∂T was essential to expand the operating temperature range of ΔT at temperatures higher than the dielectric maximum temperature. Quantitative understanding of the contributions of both ε and Pr to ΔT in unipolar electric fields is expected to guide the search for materials with a superior ECE.

DOI： 10.1063/5.0259805

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Dynamic domain motion enhancing electro-optic performance in ferroelectric films 査読

Shinya Kondo, Kazuki Okamoto, Osami Sakata, Takashi Teranishi, Akira Kishimoto, Takanori Nagasaki, Tomoaki Yamada

Applied Physics Letters 126 ( 1 ) 2025年1月

掲載種別：研究論文（学術雑誌）出版者・発行元：AIP Publishing

With the rapid advancement of information technology, there is a pressing need to develop ultracompact and energy-efficient thin-film-based electro-optic (EO) devices. A high EO coefficient in ferroelectric materials is crucial. However, substrate clamping can positively or negatively influence various physical properties, including the EO response of these films, thus complicating the development of next-generation thin-film-based devices. This study demonstrates that reversible dynamic domain motion, achieved through substrate clamping, significantly enhances the EO coefficient in epitaxial ferroelectric rhombohedral Pb(Zr, Ti)O3 thin films, where the (111) and (111¯) domains coexist with distinct optical axes. In principle, this approach can be applied to different film-substrate systems, thereby contributing to the advancement of sophisticated EO devices based on ferroelectrics.

DOI： 10.1063/5.0244707

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Doping Rare Earth Dependent Mechanical Strength Improvement on Reduction of Ceria Based Solid Electrolytes 査読

Taiga UEHARA, Shinya KONDO, Takashi TERANISHI, Akira KISHIMOTO

Journal of the Japan Society of Powder and Powder Metallurgy 71 ( 11 ) 529 - 533 2024年11月

Colossal Dielectric Constant of Nanocrystalline/Amorphous Homo-Composite BaTiO3 Films Deposited via Pulsed Laser Deposition Technique 査読

Shinya Kondo, Taichi Murakami, Loick Pichon, Joël Leblanc-Lavoie, Takashi Teranishi, Akira Kishimoto, My Ali El Khakani

Nanomaterials 14 ( 20 ) 1677 - 1677 2024年10月

掲載種別：研究論文（学術雑誌）出版者・発行元：MDPI AG

We report the pulsed laser deposition (PLD) of nanocrystalline/amorphous homo-composite BaTiO3 (BTO) films exhibiting an unprecedented combination of a colossal dielectric constant (εr) and extremely low dielectric loss (tan δ). By varying the substrate deposition temperature (Td) over a wide range (300–800 °C), we identified Td = 550 °C as the optimal temperature for growing BTO films with an εr as high as ~3060 and a tan δ as low as 0.04 (at 20 kHz). High-resolution transmission electron microscopy revealed that the PLD-BTO films consist of BTO nanocrystals (~20–30 nm size) embedded within an otherwise amorphous BTO matrix. The impressive dielectric behavior is attributed to the combination of highly crystallized small BTO nanograins, which amplify interfacial polarization, and the surrounding amorphous matrix, which effectively isolates the nanograins from charge carrier transport. Our findings could facilitate the development of next-generation integrated dielectric devices.

DOI： 10.3390/nano14201677

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Polarization at the compositional interface in Nb-doped metastable TiO₂-SnO₂ solid solutions 査読

Takashi Teranishi, Junsuke Satake, Shinya Kondo, Akira Kishimoto

Japanese Journal of Applied Physics 63 ( 7 ) 07SP05 - 07SP05 2024年7月

担当区分：最終著者掲載種別：研究論文（学術雑誌）出版者・発行元：IOP Publishing

Abstract

Polarization architecture was incorporated into metastable Nb-doped TiO₂-SnO₂ to deliver electron accumulation at the localized TiO₂-SnO₂ compositionally fluctuating interface. Specimens were quenched from various holding temperatures to ambient temperatures in air to avoid bimodal decomposition into TiO₂ and SnO₂ endmembers. At the lowest sintering temperature of 1,400 °C, the mixed phase containing TiO₂- and SnO₂-rich compositions existed as an intermediate state to the single-phase solid solution. The phase boundary became more ambiguous with increasing sintering temperatures, and the compositional fluctuation size reduced to single nanometers at 1,500 °C. The permittivity due to the interfacial polarization, ε _interface, increased steadily with increasing sintering temperature. The larger ε _interface values at higher temperatures are attributed to the greater density of the compositionally fluctuating phase interface, which leads to greater electron accumulation at the energy barrier between the two semiconducting layers.

DOI： 10.35848/1347-4065/ad5e8d

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その他リンク： https://iopscience.iop.org/article/10.35848/1347-4065/ad5e8d/pdf

Enhanced Charge Accumulation in Activated Carbon via the Dielectric Interface 査読

Yuji Toyota, Takashi Teranishi, Kosuke Fukui, Masakuni Takahashi, Ji Qiuyu, Shinya Kondo, Masanobu Nakayama, Akira Kishimoto

ACS Applied Energy Materials 7 ( 4 ) 1440 - 1447 2024年2月

外場としてのミリ波を援用した高温電気化学デバイスの特性変化査読

Takuro FUJIWARA, Takashi TERANISHI, Akira KISHIMOTO, Seiichi SUDA

Journal of the Japan Society of Powder and Powder Metallurgy 70 ( 9 ) 387 - 391 2023年9月

負膨張材料を分散させた表面層を持つセラミックス積層体の耐熱衝撃性査読

Takaya UENO, Shinya KONDO, Takashi TERANISHI, Akira KISHIMOTO

Journal of the Japan Society of Powder and Powder Metallurgy 70 ( 8 ) 376 - 379 2023年8月

Polarization contributions to DC bias characteristics of nanograined BaTiO₃-based ceramics 査読

Takashi Teranishi, Ruku Ozaki, Shinya Kondo, Akira Kishimoto

Japanese Journal of Applied Physics 62 ( SM ) SM1015 - SM1015 2023年8月

担当区分：最終著者掲載種別：研究論文（学術雑誌）出版者・発行元：IOP Publishing

Abstract

The domain configuration contributions to the DC bias characteristics of nanograined BaTiO₃ were clarified. Domain boundaries became more ambiguous with decreasing grain size (g.s.), whereas domain patterns partially vanished because of the reduction in BT ferroelectricity, in the g.s. range <1 μm. Additionally, intergranular stress increased with decreasing g.s., resulting in crystal lattice hardening in the vicinity of the domain walls (DWs) and suppression of dipole fluctuations in the DWs. These domain structural variations with the domain size (d.s.) reduced permittivity in the absence of a DC electric field, resulting in improvements in permittivity depressions in an electric field (Δε). Magnesium substitution slightly decreased the d.s. The increase in DW density upon Mg loading implied defect pairs, ${ { \rm{Mg } } }_{ { \rm{Ti } } }^{"}$–${ { \rm{V } } }_{ { \rm{o } } }^{\bullet \bullet },$ which acted as new DW pinning centers, thereby subdividing the DWs. The Δε notably improved via Mg loading, because a defect pair effectively pins the DWs under the electric field.

DOI： 10.35848/1347-4065/ace6a8

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その他リンク： https://iopscience.iop.org/article/10.35848/1347-4065/ace6a8/pdf

Spinodal decomposition-derived giant polarization in TiO2–SnO2 generated from a metastable phase 査読

Takashi Teranishi, Hideki Matsui, Shinya Kondo, Akira Kishimoto

Journal of Applied Physics 133 ( 17 ) 2023年5月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：{AIP} Publishing

<jats:p>Spinodal decomposition (SD) was incorporated into Nb-doped metastable TiO2–SnO2 to achieve giant interfacial polarization. The dielectric characteristics were analyzed using an equivalent circuit involving electron migration, where the SD bulk is given by the universal dielectric response relation. Both the Nb–TiO2 and the Nb–SnO2 layers showed semiconductive behaviors. With increasing SD treatment temperature, the SD volume fraction increased, as did cation interdiffusion at the SD interface, resulting in a large dielectric loss. The optimal SD temperature was determined as 1100 °C, where the Maxwell–Wagner capacitance showed a very high value of 44.6 μF corresponding to the permittivity at the lowest frequency exceeding 106. Such colossal polarization was considered due to an accumulation of trapped electrons at the Schottky barrier at SD layers with different conductivities.</jats:p>

DOI： 10.1063/5.0144782

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Ceria-based solid electrolyte exhibits superior mechanical and electric properties compared to zirconia-based solid electrolyte 査読

Akira Kishimoto, Taiga Umemura, Shinya Kondo, Takashi Teranishi

Ceramics International 48 ( 15 ) 21865 - 21872 2022年8月

Capacity retention improvement of LiCoO₂ cathodes via their laser-ablation-based nanodecoration by BaTiO₃ nanoparticles 査読

Takashi Teranishi, Yumi Yoshikawa, Joël Leblanc-Lavoie, Nazar Delegan, Ibrahima Ka, Akira Kishimoto, My Ali El Khakani

Journal of Applied Physics 131 ( 12 ) 124105 - 124105 2022年3月

Evaluation of superplastic-foamed zirconia-based ceramics using foaming agent and a superplasticity facilitator derived from rice husk 査読

Akira Kishimoto, Kentaro Tanaka, Takashi Teranishi

Journal of Porous Materials 29 ( 1 ) 153 - 159 2022年2月

Ultrafast Ion Transport via Dielectric Nanocube Interface 査読

Takashi Teranishi, Ryoji Yamanaka, Ken‐ichi Mimura, Mika Yoneda, Shinya Kondo, Kazumi Kato, Akira Kishimoto

Advanced Materials Interfaces 9 ( 4 ) 2101682 - 2101682 2021年12月

Revealing intrinsic electro-optic effect in single domain Pb(Zr, Ti)O3 thin films 査読

Shinya Kondo, Tomoaki Yamada, Masahito Yoshino, Takashi Teranishi, Akira Kishimoto, Takanori Nagasaki

Applied Physics Letters 119 ( 10 ) 102902 - 102902 2021年9月

Influence of orientation on the electro-optic effect in epitaxial Y-doped HfO2 ferroelectric thin films 査読

Shinya Kondo, Reijiro Shimura, Takashi TERANISHI, Akira Kishimoto, Takanori Nagasaki, Hiroshi FUNAKUBO, Tomoaki Yamada

Japanese Journal of Applied Physics 60 ( SF ) 2021年7月

Linear electro-optic effect in ferroelectric HfO2-based epitaxial thin films 査読

Shinya Kondo, Reijiro Shimura, Takashi Teranishi, Akira Kishimoto, Takanori Nagasaki, Hiroshi Funakubo, Tomoaki Yamada

Japanese Journal of Applied Physics 60 ( 7 ) 070905 - 070905 2021年7月

掲載種別：研究論文（学術雑誌）出版者・発行元：IOP Publishing

<title>Abstract</title>
Electro-optic (EO) modulators for silicon photonics using CMOS-compatible materials and processes are in great demand. In this study, epitaxial (100)-undoped HfO₂ and Y-doped HfO₂ thin films were fabricated on Sn-doped In₂O₃/yttria-stabilized zirconia(100) substrates at room temperature via magnetron sputtering. EO measurement of the Y-HfO₂ film using modulation ellipsometry showed that the phase was changed by 180° after application of positive and negative poling biases, and the modulation amplitude increased linearly with increasing AC electric field, indicating a linear EO effect based on ferroelectricity. The observed results indicate that ferroelectric HfO₂-based films are viable candidates for CMOS-compatible EO devices.

DOI： 10.35848/1347-4065/ac087d

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その他リンク： https://iopscience.iop.org/article/10.35848/1347-4065/ac087d/pdf

Ultrafast charge transfer at the electrode−electrolyte interface via an artificial dielectric layer 査読

Takashi Teranishi, Kaisei Kozai, Sou Yasuhara, Shintaro Yasui, Naoyuki Ishida, Kunihiro Ishida, Masanobu Nakayama, Akira Kishimoto

Journal of Power Sources 494 229710 - 229710 2021年5月

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論文 - 岸本　昭