Norihiko L. Okamoto Home Page

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Latest update: 2020.5.28

Since 2007.4.26

2019/4/26 Two papers have been published.
"Crystal Structure of η″-Fe₃Al_7+x Determined by Single-Crystal Synchrotron X-ray Diffraction Combined with Scanning Transmission Electron Microscopy "
Norihiko L. Okamoto, Masaya Higashi, and Haruyuki Inui
Science and Technology of Advanced Materials, 20, 543-556 (2019).
partly supported by 公益財団法人JKA (平成30~31年度).

"Zn-Based Spinel Cathode Materials for Magnesium Rechargeable Batteries: Toward Reversible Spinel–Rocksalt Transition"
Kohei Shimokawa, Taruto Atsumi, Maho Harada, Robyn E. Ward, Masanobu, Nakayama, Yu Kumagai, Fumiyasu Oba, Norihiko L. Okamoto, Kiyoshi Kanamura, and Tetsu Ichitsubo
Journal of Materials Chemistry A, 7, 12225-12235 (2019).
2019/4/4 Two papers have been published.
"Feasible Transformation of MgCo₂O₄ from Spinel to Defect Rocksalt Structure under Electron Irradiation"
Norihiko L. Okamoto, Kohei Shimokawa, Hiroshi Tanimura, and Tetsu Ichitsubo
Scripta Materialia, Vol. 167, 26-30 (2019).
"Diffusionless Isothermal Omega Transformation in Titanium Alloys Driven by Quenched-In Compositional Fluctuations"
Masakazu Tane, Hiroki Nishiyama, Akihiro Umeda, Norihiko L. Okamoto, Koji Inoue, Martin Luckabauer, Yasuyoshi Nagai, Tohru Sekino, Takayoshi Nakano, and Tetsu Ichitsubo
Physical Review Materials, Vol. 3, 043604(1-9) (2019). (Press Release)
2018/9/18
JST-PRESTO さきがけ研究領域「熱輸送のスペクトル学的理解と機能的制御」に採択されました．(平成30~33年度)
研究課題名「電気化学的インターカレーション反応を利用した熱スイッチングデバイスの創出」
2018/8/10 New Publication
"Fast Diffusion of Multivalent Ions Facilitated by Concerted Interactions in Dual-Ion Battery Systems"
Hongyi Li, Norihiko L. Okamoto, Takuya Hatakeyama, Yu Kumagai, Fumiyasu Oba and Tetsu Ichitsubo
Advanced Energy Materials, Vol. 8, Issue 27, 1801475(1-8) (2018). (Press Release).
2018/4/8
公益財団法人JKA 平成30年度研究補助(機械振興)に採択されました．(平成30~31年度)
2018/4/1
Six papers have been accepted.
"Fracture Toughness of the Fe-Zn Intermetallic Compounds Measured by Bend Testing of Chevron-Notched Single-Crystal Microbeams“
Norihiko L. Okamoto, Shota Michishita, Yukichika Hashizume, and Haruyuki Inui
ISIJ International, Vol. 58, No. 9, 1569–1577 (2018).
"Crystal structures and mechanical properties of Fe-Zn intermetallic compounds formed in the coating layer of Galvannealed steels"
Haruyuki Inui, Norihiko L. Okamoto, and Shu Yamaguchi
ISIJ International, Vol. 58, No. 9, 1550–1561 (2018).
「FCC型等原子量ハイエントロピー合金の平均原子変位と強度特性」
   岡本範彦, 弓削是貴, 乾晴行
   ミニ特集『ハイエントロピー合金の研究最前線』
   日本金属学会会報誌まてりあ，第57巻, 第7号, 312–316頁 (2018).
「合金化溶融亜鉛めっき鋼板皮膜を構成するFe-Zn系金属間化合物の結晶構造と力学特性」
岡本範彦, 乾晴行
   日本金属学会会報誌まてりあ，第57巻, 第4号, 169–175頁 (2018).
「高エントロピー合金の塑性変形挙動と単結晶マイクロピラー圧縮試験法による固溶強化量測定」
岡本範彦, 乾晴行
   日本機械学会誌第121巻, 第1192号, 12–15頁 (2018).
「ホットスタンプ加熱過程における合金化溶融亜鉛めっき構造の変化」
   仙石晃大, 竹林浩史, 岡本範彦, 乾晴行
   鉄と鋼 Vol. 104, No. 6, 331–337 (2018).
2017/10/24
"Crystal Structure Refinement of the Γ- and Γ₁-Phase Compounds in the Fe-Zn System and Orientation Relationships among α-Fe, Γ and Γ₁ Phases in the Coating Layer of Galvannealed Steel " by Norihiko L. Okamoto, Masahiro Inomoto, Hiroshi Takebayashi, and Haruyuki Inui, Journal of Alloys and Compounds, Vol. 732, 52-63 (2018), has been published.
2017/9/6
Awarded the 14th Murakami Young Researcher Award from the Japan Institute of Metals and Materials.

2017/6/1
N.L.O. has moved to Institute for Materials Research at Tohoku University.

2017/5/31
"FCC Metal-Like Deformation Behaviour of Ir₃Nb with the L1₂ Structure" by Norihiko L. Okamoto, Shohei Takemoto, Zhenghao M. T. Chen, Masatake Yamaguchi, and Haruyuki Inui, International Journal of Plasticity, Vol. 97, 145-158 (2017), has been published.
2017/5/29
Awarded the 38th Young Researcher Award from the Honda Memorial Foundation.

2017/2/20
"Crystal Structure of η’-Fe₃Al₈; Low-Temperature Phase of η-Fe₂Al₅ Accompanied by an Ordered Arrangement of Al Atoms of Full Occupancy in the C-axis Chain Sites" by Norihiko L. Okamoto, Jumpei Okumura, Masaya Higashi, and Haruyuki Inui, Acta Materialia, Vol. 129, 290-299 (2017), has been published.
2016/12/6
"Atomic Displacement in the CrMnFeCoNi High-Entropy Alloy – A Scaling Factor to Predict Solid Solution Strengthening " by Norihiko L. Okamoto, Koretaka Yuge, Katsushi Tanaka, Haruyuki Inui, and Easo P. George, AIP Advances, Vol. 6, Issue 12, 125008 (2016), has been published.
2016/10/24
"Size Effect, Critical Resolved Shear Stress, Stacking Fault Energy, and Solid Solution Strengthening in the CrMnFeCoNi High-Entropy Alloy" by Norihiko L. Okamoto, Shu Fujimoto, Yuki Kambara, Marino Kawamura, Zhenghao M. T. Chen, Hirotaka Matsunoshita, Katsushi Tanaka, Haruyuki Inui, and Easo P. George, Scientific Reports, Vol. 6, 35863 (2016), has been published. (Press Release)
2016/4/18
"Micropillar Compression Deformation of Single Crystals of Co₃(Al,W) with the L1₂ Structure" by Zhenghao M.T. Chen, Norihiko L. Okamoto, Masahiko Demura, and Haruyuki Inui, Scripta Materialia, Vol. 121, 28-31 (2016), has been published.
2016/4/1
Proposal for JSPS grants "Scientific Research (B) (基盤研究(B))" and "Challenging Exploratory Research (挑戦的萌芽研究)" have been adopted.
2015/4/19
"Crystal Structure Determination of the Γ₂ Phase in the Fe-Zn-Al System by Single-Crystal Synchrotron X-ray Diffraction Combined with Scanning Transmission Electron Microscopy" by Norihiko L. Okamoto, Haruyuki Inui, Akira Yasuhara, and Shu Yamaguchi, Journal of Alloys and Compounds, Vol. 644, 287-296 (2015), has been published.
2015/4/15
"Appropriate Zone-Axis Orientations for the Determination of Crystal Polarity by Convergent-Beam Electron Diffraction (CBED)" by Katsushi Tanaka, Norihiko L. Okamoto, Satoshi Fujio, Hiroki Sakaoto, and Haruyuki Inui, Journal of Applied Crystallography, Vol. 48, Part 3, 736–746 (2015), has been published online.
2015/1/23
"New Crystal Structure of Nd₂Ni₇ Formed on the Basis of Stacking of Block Layers" by Yuki Iwatake, Norihiko L. Okamoto, Kyosuke Kishida, Haruyuki Inui, Jun Ishida, Takuya Kai, and Shigekazu Yasuoka, International Journal of Hydrogen Energy, Vol. 40, 3023–3034 (21015), has been published.
2014/12/2
Awarded the Best Poster Award at Materials Research Society Fall Meeting 2014 in Boston, USA.
"Arrangements of Fe-Centered Zn₁₂ Icosahedra in Fe-Zn Intermetallic Compounds Determined by Ultra-High Resolution Scanning Transmission Electron Microscopy" by Norihiko L. Okamoto, Akira Yasuhara, Katsushi Tanaka and Haruyuki Inui.
2014/8/13
"Order-Disorder Structure of the δ_1k Phase in the Fe-Zn System Determined by Scanning Transmission Electron Microscopy" by Norihiko L. Okamoto, Akira Yasuhara and Haruyuki Inui, Acta Materialia, Vol. 81, 345-357 (2014), has been published.
2014/4/4
Proposal for JSPS grant "Challenging Exploratory Research (挑戦的萌芽研究)" has been adopted.
2014/3/17
"Crystal Structure Refinement of the δ_1p Phase in the Fe-Zn System by Single-Crystal X-ray Diffraction Combined with Scanning Transmission Electron Microscopy" by Norihiko L. Okamoto, Katsushi Tanaka, Akira Yasuhara and Haruyuki Inui, Acta Crystallographica B, has been published. http://dx.doi.org/10.1107/S2052520613034410
2013/12/19
"Plastic Deformation of Single Crystals of Pt₃Al with the L1₂ Structure Having a Far Al-Rich Off-Stoichiometric Composition of Pt-29at.%Al" by Norihiko L. Okamoto, Yoshihiko Hasegawa, and Haruyuki Inui, Philosophical Magazine, has been published. http://dx.doi.org/10.1080/14786435.2014.885142
2013/12/16
"Specimen- and Grain-Size Dependence of Compression Deformation Behavior in Nanocrystalline Copper" by Norihiko L. Okamoto, Daisuke Kashioka, Tetsuji Hirato and Haruyuki Inui, has been published by International Journal of Plasticity. http://dx.doi.org/10.1016/j.ijplas.2013.12.003
2013/10/29
"Micropillar Compression Deformation of Single Crystals of the Intermetallic Compound ζ-FeZn₁₃" by Norihiko L. Okamoto, Masahiro Inomoto, Hiroki Adachi, Hiroshi Takebayashi and Haruyuki Inui, has been published by Acta Materialia. http://dx.doi.org/10.1016/j.actamat.2013.10.065
2013/9/19
"Quantitative Z-Contrast Imaging of Supported Metal Complexes and Clusters—A Gateway to Understanding Catalysis on the Atomic Scale" by Nigel D. Browning, Ceren Aydin, Jing Lu, Apoorva Kulkarni, Norihiko L. Okamoto, Volkan Ortalan, Bryan W. Reed, Alper Uzun, and Bruce C. Gates, ChemCatChem, Vol. 5, Issue 9, 2673–2783 (2013), has been published. http://dx.doi.org/10.1002/cctc.201200872
2013/7/19
"Reduced thermal conductivity in nanolamellar composite comprising half-Heusler and NiAs-type phases" by Ding-Bang Xiong, Norihiko L. Okamoto, and Haruyuki Inui, Scripta Materialia, Vol. 69, Issue 7, 557–560 (2013), has been published. http://dx.doi.org/10.1016/j.scriptamat.2013.07.006
2013/6/19
"Enhanced Thermoelectric Figure of Merit in p-type Ag-doped ZnSb Nanostructured with Ag₃Sb" by Ding-Bang Xiong, Norihiko L. Okamoto, and Haruyuki Inui, Scripta Materialia, Vol. 69, Issue 5, 397–400 (2013), has been published. http://dx.doi.org/10.1016/j.scriptamat.2013.05.029
2013/6/13
"Compression Deformability of Γ and ζ Fe-Zn Intermetallics to Mitigate Detachment of Brittle Intermetallic Coating of Galvannealed Steels" by Norihiko L. Okamoto, Daisuke Kashioka, Masahiro Inomoto, Haruyuki Inui, Hiroshi Takabayashi, and Shu Yamaguchi, Scripta Materialia, Vol. 69. Issue 4, 307–310 (2013), has been published. http://dx.doi.org/10.1016/j.scriptamat.2013.05.003
2013/4/5
"Grants List" has been updated.
2013/1/1
"Plastic deformation of single crystals of Pt₃Al with the L1₂ structure" by Norihiko L. Okamoto, Yoshihiko Hasegawa, Wataro Hashimoto, and Haruyuki Inui, Philosophical Magazine, Vol.93, Issue 1–3, 60–81 (2013), has been published. DOI:10.1080/14786435.2012.705037
2012/9/2
"Photo Gallery" has been updated.
2012/3/20
Two journal papers have been added to "Publication List".
"Direct Observation of Vacancies and Local Thermal Vibration in Thermoelectric Rhenium Silicide"
Shunta Harada, Katsushi Tanaka, Kyosuke Kishida, Norihiko L. Okamoto, Noriaki Endo, Eiji Okunishi, and Haruyuki Inui
Applied Physics Express, Vol. 5, Issue 3, 035203 (2012). DOI: 10.1143/APEX.5.035203
"High-T_C Ferromagnetic Semiconductor-Like Behavior and Unusual Electrical Properties in Compounds with a 2EEEE Superstructure of the Half-Heusler Phase"
Ding-Bang Xiong, Norihiko L. Okamoto, Takeshi Waki, Yufeng Zhao, Kyosuke Kishida, and Haruyuki Inui
Chemistry A European Journal, Vol. 18, Issue 9, 2536–2542 (2012). DOI: 10.1002/chem.201102939

2011/8/1
"Plastic deformation of polycrystals of Co₃(Al,W) with the L1₂ structure" by Norihiko L. Okamoto, Takashi Oohashi, Hiroki Adachi, Kyosuke Kishida, Haruyuki Inui, and Patrick Veyssi・#8216;ｽe, Philosophical Magazine, Vol.91, Issue 28, 3667–3684 (2011), has been published. DOI: 10.1080/14786435.2011.586158
2011/3/30
Five journal papers have been added to "Publication List".
"Planar Symmetry Incompatibility in Ru-Sn-Zn Pseudo-Decagonal Approximants Composed of Novel Pentagonal Antiprisms"
Ding-Bang Xiong et al. Inorganic Chemistry, Vol. 50, Issue 3, 827–835 (2011). DOI: 10.1021/ic101720m
"Triosmium Clusters on a Support: Determination of Structure by X-ray Absorption Spectroscopy and High-Resolution Microscopy"
Shareghe Mehraeen et al. Chemistry-A European Journal,,Vol. 17, Issue 3, 1000–1008 (2011). DOI: 10.1002/chem.201000860
"Complex Alloys Containing Double-Mackay Clusters and (Sb_1-δZn_δ)₂₄ Snub Cubes Filled with Highly Disordered Zinc Aggregates: Synthesis, Structures, and Physical Properties of Ruthenium Zinc Antimonides"
Ding-Bang Xiong et al. Inorganic Chemistry, Vol. 49, Issue 23, 10788–10797 (2010). DOI: 10.1021/ic101804m
"Ru₉Zn₇Sb₈: A Structure with a 2EEEE Supercell of the Half-Heusler Phase"
Ding-Bang Xiong et al. Inorganic Chemistry, Vol. 49, Issue 22, 10536–10542 (2010). DOI: 10.1021/ic1015669
"Effects of quaternary alloying elements on the γ’ solvus temperature of Co-Ao-W based alloys with fcc / L1₂ two-phase microstructures"
Masahiro Ooshima et al. Journal of Alloys and Compounds, Vol. 508, Issue 1, 71–78 (2010). DOI: 10.1016/j.jallcom.2010.08.050
2010/9/25
Awarded the 20th Young Researcher Award (Materials Physics) from the Japan Institute of Metals.

2010/8/30
"Structural and Thermoelectric Properties of Chimney-Ladder Compounds in the Ru-Mn-Si System" by Norihiko L. Okamoto, Tatsuya Koyama, Kyosuke Kishida, Katsushi Tanaka and Haruyuki Inui, Journal of Electronic Materials, Vol. 39, Number 9, 1640-1644 (2010), has been published. DOI: 10.1007/s11664-010-1260-y
2010/3/12
ResearcherID has been added to "Profile".
2010/2/10
"Synthesis and Characterization of K_8-x(H₂)_ySi₄₆" by Doinita Neiner, Norihiko L. Okamoto, Ping Yu, Sharon Leonard, Cathie L. Condron, Michael F. Toney, Quentin M. Ramasse, Nigel D. Browning and Susan M. Kauzlarich, Inorganic Chemistry Vol. 49, Issue 3, 815-822 (2010), has been published. DOI: 10.1021/ic9004592
2009/11/12
"Anisotropic Elastic Constants and Thermal Expansivities in Monocrystal CrB₂, TiB₂, and ZrB₂" by Norihiko L. Okamoto, Misato Kusakari, Katsushi Tanaka, Haruyuki Inui and Shigeki Otani, Acta Materialia, Vol. 58, Issue 1, 76-84 (2010), has been published. DOI: 10.1016/j.actamat.2009.08.058
2009/11/6
"Validation and Generalization of a Method for Precise Size Measurements of Metal Nanoclusters" by B. W. Reed, D. G. Morgan, N. L. Okamoto, A. Kulkarni, B. C. Gates and N. D. Browning, Ultramicroscopy, Vol. 110, Issue 1, 48-60 (2009), has been published. DOI: 10.1016/j.ultramic.2009.09.005
2009/9/20
Link to "Research Grants" has been added to "Profile".
2009/9/19
Link to "Piano" has been added to "Profile".
2009/9/14
"Crystal structure and thermoelectric properties of chimney-ladder compounds in the Ru₂Si₃-Mn₄Si₇ pseudobinary system" by Norihiko L. Okamoto, Tatsuya Koyama, Kyosuke Kishida, Katsushi Tanaka and Haruyuki Inui, Acta Materialia, Vol. 57, Issue 17, 5036-5045 (2009), has been published. DOI: 10.1016/j.actamat.2009.07.005
2009/5/30
"Nearly Uniform Decaosmium Clusters Supported on MgO: Characterization by X-ray Absorption Spectroscopy and Scanning Transmission Electron Microscopy" by Apoorva Kulkarni, Shareghe Mehraeen, Bryan W. Reed, Norihiko L. Okamoto, Nigel D. Browning and Bruce C. Gates, Journal of Physical Chemistry C, Vol. 113, Issue 30, 13377-13385 (2009), has been published. DOI: 10.1021/jp903309d

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