Updated on 2025/04/30

写真a

 
SHIOTA Tadashi
 
Organization
Faculty of Environmental, Life, Natural Science and Technology Associate Professor
Position
Associate Professor
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Research Areas

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Machine elements and tribology

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

  • Nanotechnology/Materials / Structural materials and functional materials

Education

  • Osaka University   大学院工学研究科   物質・生命工学専攻

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    Notes： 博士後期課程

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Research History

  • Okayama University   The Graduate School of Natural Science and Technology   Associate Professor

    2018.4

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  • Tokyo Institute of Technology   School of Materials and Chemical Technology   Assistant Professor

    2016.4 - 2018.3

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  • Leiden University   カマリン・オンネス研究所

    2010.3 - 2010.8

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  • Tokyo Institute of Technology   Graduate School of Science and Engineering   Assistant Professor

    2007.4 - 2016.3

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  • Universiteit Leiden   Kamerlingh Onnes Laboratorium   Visiting researcher

    2005.2 - 2006.3

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Professional Memberships

 

Papers

  • Preparation of (La1 − xSrx)MnO3 − δ thin films on Si (100) substrates by a metal-organic decomposition method for smart radiation devices

    Tadashi Shiota, Yuko Mori, Jun Sugiyama, Osamu Sakurai, Akio Nishiyama, Naoki Wakiya, Sumitaka Tachikawa, Kazuo Shinozaki

    Thin Solid Films   626   154 - 158   2017.3

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

    (La1 − xSrx)MnO3 − δ (LSMO) thin films were prepared on Si(100) substrates using a metal-organic decomposition (MOD) technique for smart radiation devices used for thermal control in spacecraft. The 6 wt% concentration MOD precursor solutions were spin-coated on Si substrates. The coated films were dried at 90 °C and pyrolytically decomposed at 530 °C. Finally, they were annealed in air at 750 °C to obtain dense, polycrystalline, and single-phase perovskite LSMO films. A ferromagnetic-paramagnetic phase transition was observed close to room temperature in a LSMO film. The thermal emittance of the film was changed as a result of this phase transition. The phase transition temperature increased with an increasing Sr ratio at the A-site of the LSMO and decreased after annealing under a reduced atmosphere. Based on this result, we propose that the temperature range where the thermal emittance is widely variable can be finely tuned on demand with post-annealing.

    DOI： 10.1016/j.tsf.2017.02.037

    Scopus

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  • Photon Emission Induced by Fracture of Hard Brittle Materials

    SHIOTA Tadashi, YASUDA Kouichi

    JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS   61 ( 8 )   531 - 538   2016

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    Language：Japanese   Publisher：Japanese Society of Tribologists  

    DOI： 10.18914/tribologist.61.8_531

    CiNii Article

    CiNii Books

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  • Thermal radiative properties of (La<inf>1 - x</inf>Sr<inf>x</inf>)MnO<inf>3 - δ</inf> thin films fabricated on yttria-stabilized zirconia single-crystal substrate by pulsed laser deposition Reviewed

    Tadashi Shiota, Kenichi Sato, Jeffrey S. Cross, Naoki Wakiya, Sumitaka Tachikawa, Akira Ohnishi, Osamu Sakurai, Kazuo Shinozaki

    Thin Solid Films   593   1 - 4   2015.10

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE SA  

    © 2015 Elsevier B.V. For application as a variable thermal emittance material in a recently-developed thermal control system for spacecraft, (La1 - xSrx)MnO3 - δ (LSMO) thin films with thicknesses of 1.2 μm, 2.5 μm, and 4.3 μm were fabricated on yttria-stabilized zirconia (100) substrates by a pulsed laser deposition and ex-situ annealing at 1123 K in air. All the films were dense and their surface roughness was much smaller than the thermal infrared (IR) wavelength. The films had (100) and (110)-preferred orientations, and the thicker films showed more preferable growth along the (100) orientation. Temperature-magnetization curves revealed that the LSMO films exhibited a metal-insulator transition near room temperature. The thermal emittance of the films estimated from IR reflectance spectra and black body radiation spectra exhibited large non-linearity near room temperature owing to the phase transition. The change in thermal emittance of the LSMO films that were more than 2.5 μm thick was comparable with that of the Ca-doped LSMO ceramic tiles already used as variable thermal emittance materials. Thus, this result clearly demonstrates that LSMO thin films with thickness of 2.5 μm can work as variable thermal emittance materials in the thermal control system for spacecraft.

    DOI： 10.1016/j.tsf.2015.09.027

    Web of Science

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  • A fracture analysis of gadolinium-doped cerla ceramics to improve strength and reliability

    Kouichi Yasuda, Kazuhiro Uemura, Tadashi Shiota

    Ceramic Transactions   230   255 - 263   2012

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：American Ceramic Society  

    Strength-limiting flaws were identified in gadolinium-doped ceria (GDC) ceramics in order to improve their reliability for use as a solid oxide fuel cell. GDC ceramics were prepared by dry pressing and sintering at various temperatures. The modulus of rupture was determined by 4-point bending tests and the Weibull distributions were plotted. The fracture origins were identified to determine the cause of fracture at each sintering condition.

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  • Theoretical Estimation of Changes in Plane Elastic Waves due to Cylindrical Inclusions Reviewed

    Ryoichi Furushima, Yohtaro Matsuo, Tadashi Shiota, Kouichi Yasuda

    JOURNAL OF NONDESTRUCTIVE EVALUATION   30 ( 1 )   29 - 40   2011.3

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

    Changes in amplitude and phase shifts in plane elastic waves were theoretically estimated when they propagated through an elastic body containing cylindrical inclusions. Based on the integral equation suggested by Lavrov et al., these changes were calculated in the case when only one cylindrical inclusion was located in the body and the propagating waves have a single frequency. These calculations were expanded to more practical case when multiple cylindrical inclusions aligned in the body and the waves have some frequency band. The changes in amplitude and phase shifts calculated were associated to the changes in apparent sonic velocity and attenuation coefficient due to a structural change in the material. This theoretical approach contributes to a quantitative damage evaluation based upon structural changes in various materials by measuring the acoustical parameters such as apparent sonic velocity and attenuation coefficient.

    DOI： 10.1007/s10921-010-0087-z

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MISC

  • A Discussion of Micro Leakage Mechanism Based on Microscopic Observation of Metal Flat Gasket Surface

    林大雅, 大宮祐也, 塩田忠, 藤井正浩

    日本トライボロジー学会トライボロジー会議予稿集(CD-ROM)   2021   2021

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  • Influence of Surface Roughness on Behavior of Angle Control Tightening

    玄馬之善, 大竹遼平, 両角由貴夫, 大宮祐也, 塩田忠, 藤井正浩

    日本機械学会中国四国支部総会・講演会講演論文集(CD-ROM)   59th   2021

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  • Modeling of Damage Process for Alumina/Graphite Refractory under Uni-Axial Compressive Loading

    FURUSHIMA Ryoichi, MATSUO Yohtaro, SHIOTA Tadashi, YASUDA Kouichi

    59 ( 3 )   139 - 139   2007.3

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  • Theory of NDI for Brittle Materials and Its Application to Surface Strengthening

    MATSUO YOHTARO, SHIOTA TADASHI, YASUDA KOUICHI

    26 ( 3 )   246 - 246   2006.9

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  • Theory of NDI for Brittle Materials and its Application to Surface Strengthening

    MATSUO Yohtaro, SHIOTA Tadashi, YASUDA Kouichi

    58 ( 3 )   167 - 167   2006.3

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Presentations

  • 水潤滑下におけるステンレス基材上の酸化物コーティング膜のトライボロジー特性

    塩見公,塩田忠,大宮祐也,藤井正浩

    日本設計工学会中国支部2020年度研究発表講演会 

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    Event date： 2020.6.6

    Language：Japanese  

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  • 表面テクスチャリングが接着継ぎ手強度に与える影響

    豊田健二,大宮祐也,中西亮太,塩田忠,藤井正浩

    日本機械学会中四国支部第58期総会・講演会 

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    Event date： 2020.3.6

    Language：Japanese  

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  • レーザピーニングが浸炭硬化鋼の転動疲労寿命に及ぼす影響 International conference

    影山大恩,河渕紗英子,塩田忠,大宮祐也,藤井正浩

    日本機械学会中四国支部第58期総会・講演会 

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    Event date： 2020.3.6

    Language：Japanese  

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  • ボルト軸力にばらつきを有する管フランジ締結体の漏えい特性

    朱万玉,大宮祐也,藤井正浩,塩田忠

    日本機械学会中四国支部第58期総会・講演会 

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    Event date： 2020.3.6

    Language：Japanese  

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  • 炭化ケイ素の水潤滑しゅう動における低摩擦状態の発現に及ぼす摩擦帯電の影響

    肖佳シン,塩田忠,大宮祐也,藤井正浩

    日本機械学会中四国支部第58期総会・講演会 

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    Event date： 2020.3.6

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Research Projects

  • Development of smart radiation device by metal-insulator phase transition for artificial satellites

    Grant number：26630308  2014.04 - 2016.03

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

    Shinozaki Kazuo, SAKURAI Osamu, SHIOTA Tadashi, WAKIYA Naoki, TACHIKAWA Sumitaka

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

    (Lal-xSrx)Mn03(LSMO) thin films were deposited on Si substrate by the sputtering and the chemical solution deposition (CSD) methods for controlling the thermal emissivity with changing the ambient temperature using the metal-insulator phase transition of LSMO. This is useful for control the internal temperature of the artificial satellite. In the RF magnetron-sputtering method, it is clear that RF power is the most important process factor to determine the composition of the LSMO film. Since the composition varied both La/Sr ratio and (La+Sr)/Mn ratio in the sputtering compared with PLD, we introduce the special factor named the apparent Mn valence number = 2(3-δ)-a(3-x) in (La1-xSrx)aMnO3, The apparent Mn valence number is useful to explain consistently the tendency of phase transition temperature. In the CSD method, we determined the optimum fabrication conditions and clarified the effect of composition and annealing in various Po2 on the phase transition temperatures.

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  • Development of homogeneous solid electrolyte/electrode structureby chemical vapor deposition method

    Grant number：23656426  2011 - 2012

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

    SHINOZAKI Kazuo, SAKURAI Osamu, SHIOTA Tadashi, WAKIYA Naoki, KIGUCHI Takanori

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

    Typical fabrication process of making solid electrolyte for the fuel cell is sintering. However it brings the inhomogeneity of cations from the in sufficient mixing of the raw materials and local diffusion during the sintering and also during long time running of power generation. These inhomogeneity is enhanced the large amount of trivalent cation doping, such as 20-30 at%. We proposed the chemical vapor deposition (CVD) using Ce(EtCp)_4 (Ce (C_5H_4C_2H_5)_4) and Gd(EtCp)_3 (Gd(C_5H_4C_2H_5)_3) as the source materials. In this research, we determined the optimum condition of these raw materials for CVD process for low-pressure coldwall-type-CVD apparatus. We succeeded to fabricate the columnar type GDC film on Al_2O_3, SiO_2/Si substrates. It was found that the film was grown at around 300℃ and has columnar structure that means no grain boundary in the out of plane direction. Since thinner thickness of the film and almost no grain boundary along the out of plane direction, oxide ion can be able to diffuse even at 180℃ by AC measurement. New type atmospheric pressure CVD apparatus was developed to grow the film with very fast growth rate. We also tried to fabricated the porous electrodes with dense surface layer for the anode: Ni-GDC and the cathode: LaSrCoO_3-GDC. GDC thin films by low pressure CVD were fabricated on the porous electrodes, and tried to generate the electric power in the H_2-O_2 system. Since the power generation test system is preliminary, but we have several important point to realize the CVD derived electrolyte system.

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  • Kinematical Theory for Grain Motion during Superplastic Deformation

    Grant number：20560067  2008 - 2011

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

    YASUDA Kouichi, SHIOTA Tadashi, OKAMOTO Taku

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    Grant amount：\4550000 （ Direct expense: \3500000 、 Indirect expense：\1050000 ）

    The displacement vectors of 748 grains of tetragonal zirconia ceramics were measured by electron microscopic observation of grain structure before and after superplastic deformation. Trajectory analysis showed that grains moved in zigzag way. So, the displacement vector was divided into the random walk vector and the drift vector calculated by finite element analysis Variances of random walk vectors for tensile direction and lateral direction had an inverse correlation at the beginning of superplastic deformation, however, these two variances became the almost same value with the deformation. The tendency was analyzed with Langevin equation.

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  • Phonon analysis and crystal chemical simulation of dielectrics based on sub-millimeter wave ellipsometry

    Grant number：19206068  2007 - 2009

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

    TSURUMI Takaaki, TAKEDA Hiroaki, HOSHINA Takuya

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    Grant amount：\47450000 （ Direct expense: \36500000 、 Indirect expense：\10950000 ）

    Sub-millimeter wave spectroscopic ellipsometry has been developed to study the size effect of barium titanate and the phase transition behaviors of barium titanate-based relaxors. Ellipsometer is equipment which measures the change of polarizing state of reflected light to determine the complex dielectric permittivity of materials. Accuracy of the ellipsometer developed in this study was verified and the complex permittivity of a barium titanate single crystal was directly determined using it. S for the size effect, the permittivity of barium titanate ceramics increased with decreasing grain size when the grain size was over 1.1μm, while that decreased when the grain size was below 1μm. Most of the domains in BaTiO_3 grains had simple lamellar structures, and 90° domain width decreased with decreasing grain size. Based on wide band dielectric spectroscopy, the domain contribution to the permittivity was investigated. In BaTiO_3 ceramics with grain sizes over 1μm, the dipole and ionic polarizabilities were enhanced by the high domain density. In contrast, for the BaTiO_3 ceramics with grain sizes below 1μm, these polarizabilities were weakened. As for the phase transition of barium titanate-based relaxors, wideband dielectric spectra from kHz to THz were measured for ceramics of BaTiO_3 (BT), Ba_<0.6>Sr_<0.4>TiO_3 (BST-0.6) and BaZr_<0.25>Ti_<0.75>O_3 (BZT-0.25). The behavior in the dipole polarization near the dielectric maximum temperature (T_m) in BST-0.6 and BZT-0.25 could be explained by the behavior in polar nanoregions (PNRs), while the ferroelectric domains contribute to dipole polarization in BT. Relaxation in BT could be interpreted as successive change in polarization behavior from normal ferroelectrics to relaxor ferroelectric via DPT ferroelectrics.

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Class subject in charge

  • Tribological Machine Design （2024academic year） Prophase  - 火3～4,木1～2

  • Advanced Tribological Machine Design （2024academic year） Prophase  - 火3～4,木1～2

  • Basic Mechanical System Drawing （2024academic year） 1st and 2nd semester  - 木5～8

  • Basic Mechanical System Drawing （2024academic year） 1st and 2nd semester  - 水5～8

  • Basic Mechanical System Drawing （2024academic year） 1st and 2nd semester  - 木5～8

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