廣井　慧（Satoshi Hiroi）

プロフィール
回折・散乱 Ⅱ グループ　低次元・非周期構造チーム

博士研究員

メール： s_hiroi＠spring8.or.jp


全散乱測定から得られる原子対相関関数(pair distribution function, PDF)を基にした原子・分子レベルの構造解析研究を行っています。解析対象は非晶・結晶・ナノ構造材料などの様々な系であり、原子配置モデリングの解析技術を駆使して、平均構造に埋もれた局所的な構造の乱れの解明に取り組んでいます。


キーワード

  • 非晶質材料・不規則系
  • 結晶PDF解析
  • RMCシミュレーション
研究開発成果

研究論文

  • ”Structural Characterization of the Delithiated Noncrystalline Phase in a Li-Rich Li2VO2F Cathode Material” S. Hiroi*, K. Ohara and O. Sakata*, Chemistry of Materials in press
  • ”Calculation of total scattering from a crystalline structural model based on experimental optics parameters” S. Hiroi*, K. Ohara, S. Ohuchi, Y. Umetani, T. Kozaki, E. Igaki and O. Sakata, Journal of Applied Crystallography 53 (2020) 671-678.
  • ”Phonon scattering at the interfaces of epitaxially grown Fe2VAl/W and Fe2VAl/Mo superlattices” S. Hiroi, S. Nishino, S. Choi, O. Seo, J. Kim, Y. Chen, C. Song, A. Tayal, O. Sakata, and T. Takeuchi*, Journal of Applied Physics 125 (2019) 225101.
  • ”Analyzing the Boundary Thermal Resistance of Epitaxially Grown Fe3VAl/W Layers by Picosecond Time-Domain Thermoreflectance” S. Hiroi*, S. Choi, S. Nishino, O. Seo, Y. Chen, O. Sakata and T. Takeuchi, Journal of Electronic Materials 47 (2018) 3113-3118.
  • ”Thickness dependence of thermal conductivity and electron transport properties of Fe2VAl thin-films prepared by RF sputtering technique” S. Hiroi, M. Mikami, K. Kitahara and T. Takeuchi*, International Journal of Nanotechnology 13(10-12) (2016) 881-890.
  • ”Thermoelectric Properties of Fe2VAl-Based Thin-Films Deposited at High Temperature” S. Hiroi, M. Mikami and T. Takeuchi*, Materials transactions 57(9) (2016) 1628-1632.
  • ”Highly Stable and Active Solid-Solution-Alloy Three-Way Catalyst by Utilizing Configurational-Entropy Effect” K. Kusada, D. Wu, Y. Nanba, M. Koyama, T. Yamamoto, X. Q. Tran, T. Toriyama, S. Matsumura, A. Ito, K. Sato, K. Nagaoka, O. Seo, C. Song, Y. Chen, N. Palina, L. S. R. Kumara, S. Hiroi, O. Sakata, S. Kawaguchi, Y. Kubota and H. Kitagawa, Advanced Materials 33.16 (2021) 2005206.
  • ”Efficient overall water splitting in acid with anisotropic metal nanosheets” D. Wu, K. Kusada, S. Yoshioka, T. Yamamoto, T. Toriyama, S. Matsumura, Y. Chen, O. Seo, J. Kim, C. Song, S. Hiroi, O. Sakata, T. Ina, S. Kawaguchi, Y. Kubota, H. Kobayashi and H. Kitagawa, Nature Communications 12 (2021) 1145.
  • ”Detailed structural analysis of amorphous Pd40Cu40P20: Comparison with the metallic glass Pd40Ni40P20 from the viewpoint of glass forming ability” S. Hosokawa, J.-F. Bérar, N. Boudet, W.-C. Pilgrim, L. Pusztai, S. Hiroi, S. Kohara, H. Kato, H. E. Fischer and A. Zeidler, Journal of Non-Crystalline Solids 555 (2021) 120536.
  • ”Crossover in periodic length dependence of thermal conductivity in 5d element substituted Fe2VAl-based superlattices” S. Choi, S. Hiroi, M. Inukai, S. Nishino, R. Sobota, D. Byeon, M. Mikami, E. Minamitani, M. Matsunami and Tsunehiro Takeuchi, Physical Review B 102 (2020) 104301.
  • ”On the electronic structure and hydrogen evolution reaction activity of platinum group metal-based high-entropy-alloy nanoparticles” D. Wu, K. Kusada, T. Yamamoto, T. Toriyama, S. Matsumura, I. Gueye, O. Seo, J. Kim, S. Hiroi, O. Sakata, S. Kawaguchi, Y. Kubota and H. Kitagawa, Chemical Science 11.47 (2020) 12731-12736.
  • ”Crystalline to amorphous transformation in solid-solution alloy nanoparticles induced by boron doping” K. Kobayashi, K. Kusada, D. Wu, N. Ogiwara, H. Kobayashi, M. Haruta, H. Kurata, S. Hiroi, O. Seo, C. Song, Y. Chen, J. Kim, A. Tayal, O. Sakata, K. Ohara, T. Honma and H. Kitagawa, Chemical Communications 56 (2020) 12941-12944.
  • ”Observation of Liquid Phase Synthesis of Sulfide Solid Electrolytes Using Time-Resolved Pair Distribution Function Analysis” K. Ohara, N. Masuda, H. Yamaguchi, A. Yao, S. Tominaka, H. Yamada, S. Hiroi, M. Takahashi, K. Yamamoto, T. Wakihara, Y. Uchimoto, F. Utsuno and S. Kimura, physica status solidi (b) 257.11 (2020) 2000106.
  • ”Hydrogen absorption and desorption on Rh nanoparticles revealed by in situ dispersive X-ray absorption fine structure spectroscopy” C. Song, O. Seo, D. Matsumura, S. Hiroi, Y.-T. Cui, J. Kim, Y. Chen, A. Tayal, K. Kusada, H. Kobayashi, H. Kitagawa and O. Sakata, RSC Advances 10 (2020) 19751-19758.
  • ”Effects of partial substitution by 5d heavy elements on the thermal transport in Fe 2 VAl thin films” S. Choi, S. Hiroi, M. Inukai, S. Nishino, R. Sobota, D. Byeon, M. Mikami, M. Matsunami, and T. Takeuchi*, Physical Review B 101 (2020) 104312.
  • ”Surface morphology smoothing of a 2 inch-diameter GaN homoepitaxial layer observed by X-ray diffraction topography” J. Kim, O. Seo, S. Hiroi, Y. Irokawa, T. Nabatame, Y. Koide and O. Sakata*, RSC Advances 10.4 (2020) 1878-1882.
  • ”Discovery of face-centred cubic Os nanoparticles” T. Wakisaka, K. Kusada, T. tomokazu, T. Toriyama, S. Matsumura, I. Gueye, O. Seo, J. Kim, S. Hiroi, O. Sakata, S. Kawaguchi, Y. Kubota and H. Kitagawa*, Chemical Communications 56 (2020) 372-374.
  • ”Investigation of selective chemisorption of fcc and hcp Ru nanoparticles using X-ray photoelectron spectroscopy analysis” I. Gueye, J. Kim, L.S.R. Kumara, A. Yang, O. Seo, Y. Chen, C. Song, S. Hiroi, K. Kusada, H. Kobayashi, H. Kitagawa and O. Sakata*, Journal of Catalysis 380 (2019) 247-253.
  • ”Partial structure investigation of the traditional bulk metallic glass Pd40 Ni40 P20” S. Hosokawa, J.-F. Bérar, N. Boudet, W.-C. Pilgrim, L. Pusztai, S. Hiroi, K. Maruyama, S. Kohara, H. Kato, H. E. Fischer, and Anita Zeidler, Physical Review B 100 (2019) 054204.
  • ”Lattice-plane bending angle modulation of Mg-doped GaN homoepitaxial layer observed by X-ray diffraction topography” J. Kim, O. Seo, C. Song, S. Hiroi, Y. Chen, Y. Irokawa, T. Nabatame, Y. Koide and O. Sakata*, CrystEngComm 21 (2019) 2281-2285.
  • ”Mapping of a Lattice-Plane Tilting in a GaN Wafer Using Energy-Resolved X-Ray Diffraction Topography” J. Kim, O. Seo, C. Song, S. Hiroi, Y. Chen, Y. Irokawa, T. Nabatame, Y. Koide, and O. Sakata*, Physical Review Applied 11(2) (2019) 024072.
  • ”Tuning of structural, optical band gap, and electrical properties of room-temperature-grown epitaxial thin films through the Fe2O3:NiO ratio” O. Seo, A. Tayal, J. Kim, C. Song, Y. Chen, S. Hiroi, Y. Katsuya, T. Ina, O. Sakata*, Y. Ikeya, S. Takano, A. Matsuda* and M. Yoshimoto, Scientific reports 9(1) (2019) 1-9.
  • ”Local Geometry and Electronic Properties of Nickel Nanoparticles Prepared via Thermal Decomposition of Ni-MOF-74” A. Tayal*, Y. Chen, C. Song, S. Hiroi, L.S.R. Kumara, N. Palina, O. Seo, M. Mukoyoshi, H. Kobayashi, H. Kitagawa and Osami Sakata*, Inorganic Chemistry 57(16) (2018) 10072-10080.
  • ”Lepidocrocite-type titanate formation from isostructural prestructures under hydrothermal reactions: observation by synchrotron X-ray total scattering analyses” S. Tominaka*, H. Yamada, S. Hiroi, S. I. Kawaguchi, and K. Ohara, ACS Omega 3(8) (2018) 8874-8881.
  • ”Characterization of a 4-inch GaN wafer by X-ray diffraction topography” J. Kim, O. Seo, C. Song, Y. Chen, S. Hiroi, Y. Irokawa, T. Nabatame, Y. Koide and O. Sakata*, CrystEngComm 20 (2018) 7761-7765.
  • ”Synchrotron X-ray diffraction characterization of the inheritance of GaN homoepitaxial thin films grown on selective growth substrates” Y. Lou, C. Song, Y. Chen, L.S.R. Kumara, N. Palina, O. Seo, S. Hiroi, K. Kajiwara, M. Hoshino, K. Uesugi, Y. Irokawa, T. Nabatame, Y. Koide and O. Sakata*, CrystEngComm 20 (2018) 2861-2867.
  • ”Correlation between the electronic/local structure and CO-oxidation activity of PdxRu1-x alloy nanoparticles” C. Song, A. Tayal, O. Seo, J. Kim, Y. Chen, S. Hiroi, L.S.R. Kumara, K. Kusada, H. Kobayashi, H. Kitagawa and O. Sakata*, Nanoscale Advances 1 (2018) 546-553.
  • ”Temperature Dependent Octahedral Tilting Behaviors of Monoclinic and Tetragonal SrRuO3 Thin Films” S.S. Lee, O. Seo*, J. Kim, C. Song, S. Hiroi, Y. Chen, Y. Katsuya and Osami Sakata, Journal of the Korean Physical Society 73 (2018) 1529-1534.
  • ”Size effects on rhodium nanoparticles related to hydrogen-storage capability” C. Song, A. Yang, O. Sakata*, L.S.R. Kumara, S. Hiroi, Y.-T. Cui, K. Kusada, H. Kobayashi and H. Kitagawa, Physical Chemistry Chemical Physics 20 (2018) 15183-15191.
  • ”Lattice-plane orientation mapping of homo-epitaxial GaN (0001) thin films via grazing-incidence X-ray diffraction topography in 2-in. wafer” J. Kim, O. Seo, C. Song, S. Hiroi, Y. Chen, Y. Irokawa, T. Nabatame, Y. Koide and O. Sakata*, Applied Physics Express 11(8) (2018) 081002.
  • ”Time-resolved pair distribution function analysis of disordered materials on beamlines BL04B2 and BL08W at SPring-8” K. Ohara, S. Tominaka, H. Yamada, M. Takahashi, H. Yamaguchi, F. Utsuno, T. Umeki, A. Yao, K. Nakada, M. Takemoto, S. Hiroi, N. Tsuji and T. Wakihara, Journal of synchrotron radiation 25(6) (2018) 1627-1633.
  • ”Evaluation of lattice curvature and crystalline homogeneity for 2-inch GaN homo-epitaxial layer” O. Seo, J. Kim, C. Song, Y. Lou, L.S.R. Kumara, S. Hiroi, Y. Chen, Y. Katsuya, Y. Irokawa, T. Nabatame, Y. Koide, and O. Sakata*, AIP Advances 8(7) (2018) 075318.
  • ”Lattice constant, bond-orientational order, and solid solubility of PdPt bimetallic nanoparticles” O. Seo, J. Kim, S. Hiroi, C. Song, L.S.R. Kumara, A. Tayal, Y. Chen, H. Kobayashi, H. Kitagawa, and O. Sakata*, Applied Physics Letters 113(7) (2018) 071907.
  • ”Stacking fault density and bond orientational order of fcc ruthenium nanoparticles” O. Seo, O. Sakata*, J. Kim, S. Hiroi, C. Song, L.S.R. Kumara, K. Ohara, S. Dekura, K. Kusada, H. Kobayashi, and H. Kitagawa, Applied Physics Letters 111(25) (2017) 253101.

国際会議発表（本人登壇のみ）

  • Satoshi Hiroi, Koji Ohara and Osami Sakata, "Structural Modeling Technique for Crystalline Metal Nanoparticles by X-ray Total Scattering Data", Materials Reseach Meeting 2019, Dec/2019 Yokohama.
  • Satoshi Hiroi, Song chulho and and Osami Sakata, "Structural modeling of metal nanoparticles by x-ray total scattering data", AsCA2018, Dec/2018, Auckland.

競争的資金

  • 科学研究費助成事業 若手 （2020年度〜2022年度）「X線全散乱を利用した非晶・結晶混合物に対する革新的構造解析技術の確立」(No. 20K15031) 研究代表者
  • 科学研究費助成事業 若手B（2016年度〜2018年度）「熱電特性の大幅な改善を実現するFe2VAl系人工超格子膜の創製」(No. 16K21464) 研究代表者

受賞歴

  • 「蓄電固体界面科学」第２回若手勉強会 最優秀発表賞 「X線全散乱法による構造解析技術の結晶・非晶混相材料への展開」（2020年9月） 受賞者: 廣井 慧
  • 応用物理学会2018年秋季学術講演会 Poster Award 「X線全散乱データを用いた金属ナノ粒子の構造モデリング手法」（2018年9月） 受賞者: 廣井 慧, 宋 哲昊, 坂田 修身

特許出願歴

  • X線全散乱による結晶構造解析方法(特願 2018-233975) 廣井 慧, 坂田 修身, 尾原 幸治, 井垣 恵美子, 大内 暁, 神前 隆, 梅谷 幸宏

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