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新津 甲大

新津 甲大 (NIITSU, Kodai) 0000-0002-0430-8868

Address
305-0047 茨城県つくば市千現1-2-1 [アクセス]

[論文] | [書籍] | [会議録] | [口頭発表] | [その他の文献] | [公開特許出願]

論文 TSV

2023
  1. Yuta Kimura, Xiao Xu, Kwangsik Han, Kodai Niitsu, Toshihiro Omori, Rie Y. Umetsu, Ryosuke Kainuma. R-Phase Transformation in Ti50−xNi47+xFe3 Shape Memory Alloys. MATERIALS TRANSACTIONS. 64 [7] (2023) MT-M2023003 10.2320/matertrans.mt-m2023003
  2. 新津 甲大. 超弾性とその弾性熱量効果. 熱測定. 50 [2] (2023) 70-75
  3. K. Niitsu, Y. Yano, R. Kainuma, H. Inui. Viscosity of superelasticity: A comprehensive interpretation of nonreciprocal isothermal dynamics, kinetic arrest, and nonergodic anelastic strain based on thermal activation of martensitic transformations. Physical Review B. 108 [13] (2023) 134103 10.1103/physrevb.108.134103
  4. Fumihiko Ichihara, Kodai Niitsu, Yoshinori Tanaka, Yasuhiro Niwa, Kazutaka Mitsuishi, Shogo Miyoshi, Takahisa Ohno, Takuya Masuda. Structural Analysis of the LiCoPO4 Electrode/NASICON-Type Li1.3Al0.3Ti1.7(PO4)3 Solid Electrolyte Interface. The Journal of Physical Chemistry C. 127 [31] (2023) 15043-15050 10.1021/acs.jpcc.3c02132
  5. K. Nakazawa, S. Lee, K. Niitsu, M. Kameyama, T. Sannomiya, S. Kohara, K. Mitsuishi, K. Tsuchiya. Nanoscale strain mapping and symmetry analysis of Zr50Cu40Al10 metallic glass rejuvenated by high-pressure torsion via 4D scanning transmission electron microscopy. Journal of Non-Crystalline Solids. 606 (2023) 122197 10.1016/j.jnoncrysol.2023.122197
2022
  1. Kodai Niitsu, Yizhou Liu, Alexander C. Booth, Xiuzhen Yu, Nitish Mathur, Matthew J. Stolt, Daisuke Shindo, Song Jin, Jiadong Zang, Naoto Nagaosa, Yoshinori Tokura. Geometrically stabilized skyrmionic vortex in FeGe tetrahedral nanoparticles. Nature Materials. 21 [3] (2022) 305-310 10.1038/s41563-021-01186-x
  2. Zentaro Akase, Kenta Kimura, Tomohiro Saito, Kodai Niitsu, Toshiaki Tanigaki, Yoh Iwasaki, Parmanand Sharma, Akihiro Makino, Daisuke Shindo. Magnetic flux in soft magnetic Fe-Si-B-P-Cu amorphous alloy containing nanocrystallites analyzed by electron holography. Journal of Magnetism and Magnetic Materials. 541 (2022) 168519 10.1016/j.jmmm.2021.168519 Open Access
2021
  1. Tetsuya Hamada, Masaya Higashi, Kodai Niitsu, Haruyuki Inui. Phase equilibria among η-Fe2Al5 and its higher-ordered phases. Science and Technology of Advanced Materials. 22 [1] (2021) 373-385 10.1080/14686996.2021.1915691 Open Access
  2. N. Hanasaki, M. Oda, K. Niitsu, K. Ehara, H. Murakawa, H. Sakai, H. Nitani, H. Abe, H. Sagayama, H. Uetsuka, T. Karube, H. Inui. Element dependence of local disorder in medium-entropy alloy CrCoNi. AIP Advances. 11 [12] (2021) 125216 10.1063/5.0072766 Open Access
  3. Yuki Sugiura, Kodai Niitsu, Yasuko Saito, Takashi Endo, Masanori Horie. Inorganic process for wet silica-doping of calcium phosphate. RSC Advances. 11 [20] (2021) 12330-12335 10.1039/d1ra00288k Open Access
  4. Dengshan Zhou, Zhenghao Chen, Kazuki Ehara, Kodai Nitsu, Katsushi Tanaka, Haruyuki Inui. Effects of annealing on hardness, yield strength and dislocation structure in single crystals of the equiatomic Cr-Mn-Fe-Co-Ni high entropy alloy. Scripta Materialia. 191 (2021) 173-178 10.1016/j.scriptamat.2020.09.039
2020
  1. Kodai Niitsu, Makoto Asakura, Koretaka Yuge, Haruyuki Inui. Prediction of Face-Centered Cubic Single-Phase Formation for Non-Equiatomic Cr–Mn–Fe–Co–Ni High-Entropy Alloys Using Valence Electron Concentration and Mean-Square Atomic Displacement. MATERIALS TRANSACTIONS. 61 [9] (2020) 1874-1880 10.2320/matertrans.mt-m2020144
  2. Yuki Sugiura, Hideki Obika, Masanori Horie, Kodai Niitsu, Yoji Makita. Aesthetic Silver-Doped Octacalcium Phosphate Powders Exhibiting Both Contact Antibacterial Ability and Low Cytotoxicity. ACS Omega. 5 [38] (2020) 24434-24444 10.1021/acsomega.0c02868 Open Access
  3. Kodai Niitsu. Temperature dependence of magnetic exchange stiffness in iron and nickel. Journal of Physics D: Applied Physics. 53 [39] (2020) 39LT01 10.1088/1361-6463/ab9672
  4. K. Niitsu, H. Date, R. Kainuma. Thermal activation of stress-induced martensitic transformation in Ni-rich Ti-Ni alloys. Scripta Materialia. 186 (2020) 263-267 10.1016/j.scriptamat.2020.05.010
  5. Ken Harada, Marek Malac, Misa Hayashida, Koudai Niitsu, Keiko Shimada, Darren Homeniuk, Marco Beleggia. Toward the quantitative the interpretation of hole-free phase plate images in a transmission electron microscope.. Ultramicroscopy. 209 (2020) 112875 10.1016/j.ultramic.2019.112875
  6. Hao Wang, Hongwei Geng, Dengshan Zhou, Kodai Niitsu, Ondrej Muránsky, Deliang Zhang. Multiple strengthening mechanisms in high strength ultrafine-grained Al–Mg alloys. Materials Science and Engineering: A. 771 (2020) 138613 10.1016/j.msea.2019.138613
  7. K. Niitsu, X. Xu, R. Y. Umetsu, R. Kainuma, K. Harada. Temperature dependence of exchange stiffness in an off-stoichiometric Ni2MnIn Heusler alloy. Physical Review B. 101 [1] (2020) 014443 10.1103/physrevb.101.014443
2019
  1. Youngji Cho, Kodai Niitsu, Yoshihiro Midoh, Koji Nakamae, Daisuke Shindo, Jun-Mo Yang, Yasukazu Murakami. Suppressing Geometric Phase Shift Owing to Antiphase Boundaries in Dark-Field Electron Holography. MATERIALS TRANSACTIONS. 60 [5] (2019) 698-703 10.2320/matertrans.mc201809
  2. Nitish Mathur, Matthew J. Stolt, Kodai Niitsu, Xiuzhen Yu, Daisuke Shindo, Yoshinori Tokura, Song Jin. Electron Holography and Magnetotransport Measurements Reveal Stabilized Magnetic Skyrmions in Fe1–xCoxSi Nanowires. ACS Nano. 13 [7] (2019) 7833-7841 10.1021/acsnano.9b02130
  3. Ken Harada, Kodai Niitsu, Keiko Shimada, Tetsuji Kodama, Tetsuya Akashi, Yoshimasa A Ono, Daisuke Shindo, Hiroyuki Shinada, Shigeo Mori. Electron holography on Fraunhofer diffraction. Microscopy. 68 [3] (2019) 254-260 10.1093/jmicro/dfz007 Open Access
2018
  1. Ken Harada, Tetsuya Akashi, Kodai Niitsu, Keiko Shimada, Yoshimasa A. Ono, Daisuke Shindo, Hiroyuki Shinada, Shigeo Mori. Interference experiment with asymmetric double slit by using 1.2-MV field emission transmission electron microscope. Scientific Reports. 8 [1] (2018) 1008 10.1038/s41598-018-19380-4 Open Access
  2. K. Niitsu, T. Tanigaki, K. Harada, D. Shindo. Temperature dependence of 180° domain wall width in iron and nickel films analyzed using electron holography. Applied Physics Letters. 113 [22] (2018) 222407 10.1063/1.5056308
  3. K. Harada, K. Shimada, Y. A. Ono, Y. Iwasaki, K. Niitsu, D. Shindo. Electron holography study on vortex beam phases in real space. Microscopy and Microanalysis. 24 [S1] (2018) 1470-1471 10.1017/s1431927618007833
  4. K. Niitsu, A. Sato, T.T. Sasaki, R. Sawada, Y. Cho, Y. Takada, T. Sato, Y. Kaneko, A. Kato, T. Ohkubo, D. Shindo, K. Hono, Y. Murakami. Magnetization measurements for grain boundary phases in Ga-doped Nd-Fe-B sintered magnet. Journal of Alloys and Compounds. 752 (2018) 220-230 10.1016/j.jallcom.2018.04.055 Open Access
  5. Kiyou Shibata, Toshiaki Tanigaki, Tetsuya Akashi, Hiroyuki Shinada, Ken Harada, Kodai Niitsu, Daisuke Shindo, Naoya Kanazawa, Yoshinori Tokura, Taka-hisa Arima. Current-Driven Motion of Domain Boundaries between Skyrmion Lattice and Helical Magnetic Structure. Nano Letters. 18 [2] (2018) 929-933 10.1021/acs.nanolett.7b04312
  6. Kodai Niitsu, Yuta Kimura, Toshihiro Omori, Ryosuke Kainuma. Cryogenic superelasticity with large elastocaloric effect. NPG Asia Materials. 10 [1] (2018) e457 10.1038/am.2017.213 Open Access
2017
  1. Toshiaki Tanigaki, Tetsuya Akashi, Akira Sugawara, Katsuya Miura, Jun Hayakawa, Kodai Niitsu, Takeshi Sato, Xiuzhen Yu, Yasuhide Tomioka, Ken Harada, Daisuke Shindo, Yoshinori Tokura, Hiroyuki Shinada. Magnetic field observations in CoFeB/Ta layers with 0.67-nm resolution by electron holography. Scientific Reports. 7 [1] (2017) 16598 10.1038/s41598-017-16519-7 Open Access
  2. Kodai Niitsu, Yuta Kimura, Ryosuke Kainuma. Transformation entropy change and precursor phenomena in Ni-rich Ti–Ni shape memory alloys. Journal of Materials Research. 32 [20] (2017) 3822-3830 10.1557/jmr.2017.377
  3. R. Sawada, T. Yamamoto, K. Minakuchi, M. Nagasako, Y. Hayasaka, K. Niitsu, Y. Cho, R. Kainuma, Y. Murakami. Cellular microstructures superposed on martensite plates in Mn 55.2 Ga 19.0 Cu 25.8 alloy showing large coercivity. Scripta Materialia. 135 (2017) 33-36 10.1016/j.scriptamat.2017.03.013
  4. Hiroaki Suzuki, Zentaro Akase, Kodai Niitsu, Toshiaki Tanigaki, Daisuke Shindo. Secondary electron effect on electron beam induced charging of SiO2particle analyzed by electron holography. Microscopy. (2017) 10.1093/jmicro/dfw112
  5. K. Niitsu, K. Minakuchi, X. Xu, M. Nagasako, I. Ohnuma, T. Tanigaki, Y. Murakami, D. Shindo, R. Kainuma. Atomic-resolution evaluation of microsegregation and degree of atomic order at antiphase boundaries in Ni 50 Mn 20 In 30 Heusler alloy. Acta Materialia. 122 (2017) 166-177 10.1016/j.actamat.2016.09.035 Open Access
2016
  1. Yuta Kimura, Xiao Xu, Kodai Niitsu, Toshihiro Omori, Ryosuke Kainuma. Martensitic Transformations and Superelastic Behavior at Low Temperatures in Ti<sub>50−</sub><i><sub>x</sub></i>Ni<sub>40+</sub><i><sub>x</sub></i>Cu<sub>10</sub> Shape Memory Alloys. MATERIALS TRANSACTIONS. 57 [3] (2016) 269-277 10.2320/matertrans.mb201504
  2. Yasukazu Murakami, Kodai Niitsu, Syuhei Kaneko, Toshiaki Tanigaki, Taisuke Sasaki, Zentaro Akase, Daisuke Shindo, Tadakatsu Ohkubo, Kazuhiro Hono. Strain measurement in ferromagnetic crystals using dark-field electron holography. Applied Physics Letters. 109 [19] (2016) 193102 10.1063/1.4967005
  3. Toshiaki Tanigaki, Ken Harada, Yasukazu Murakami, Kodai Niitsu, Tetsuya Akashi, Yoshio Takahashi, Akira Sugawara, Daisuke Shindo. New trend in electron holography. Journal of Physics D: Applied Physics. 49 [24] (2016) 244001 10.1088/0022-3727/49/24/244001
2015
  1. K. Niitsu, Y. Kimura, X. Xu, R. Kainuma. Composition Dependences of Entropy Change and Transformation Temperatures in Ni-rich Ti–Ni System. Shape Memory and Superelasticity. 1 [2] (2015) 124-131 10.1007/s40830-015-0023-2
2014
  1. Kodai Niitsu, Ryosuke Kainuma. Effect of annealing on stress-induced transformation behaviors at low temperatures in a Ti-51.8 at.% Ni shape memory alloy. physica status solidi (b). 251 [10] (2014) 2041-2047 10.1002/pssb.201350418
  2. Y. Murakami, K. Niitsu, T. Tanigaki, R. Kainuma, H. S. Park, D. Shindo. Magnetization amplified by structural disorder within nanometre-scale interface region. Nature Communications. 5 [1] (2014) 4133 10.1038/ncomms5133 Open Access
2013
  1. K. Niitsu, X. Xu, R. Y. Umetsu, R. Kainuma. Stress-induced transformations at low temperatures in a Ni45Co5Mn36In14metamagnetic shape memory alloy. Applied Physics Letters. 103 [24] (2013) 242406 10.1063/1.4840336
  2. K. Niitsu, S. Fujieda, A. Fujita, R. Kainuma. Microstructure and magnetic properties of as-quenched cubic and tetragonal La(Fe1−xSix)13 compounds. Journal of Alloys and Compounds. 578 (2013) 220-227 10.1016/j.jallcom.2013.05.059
  3. K. Niitsu, T. Omori, R. Kainuma. Stress-induced transformation behaviors at low temperatures in Ti-51.8Ni (at. %) shape memory alloy. Applied Physics Letters. 102 [23] (2013) 231915 10.1063/1.4809935
  4. Y. Murakami, K. Yanagisawa, K. Niitsu, H.S. Park, T. Matsuda, R. Kainuma, D. Shindo, A. Tonomura. Determination of magnetic flux density at the nanometer-scale antiphase boundary in Heusler alloy Ni50Mn25Al12.5Ga12.5. Acta Materialia. 61 [6] (2013) 2095-2101 10.1016/j.actamat.2012.12.029
2012
  1. Kodai Niitsu, Ryosuke Kainuma. Effect of Microalloying Elements on Solidification Microstructure of the La(Fe<sub>0</sub><sub>.</sub><sub>89</sub>Si<sub>0</sub><sub>.11</sub>)<sub>13</sub> Alloy. Key Engineering Materials. 508 (2012) 172-177 10.4028/www.scientific.net/kem.508.172
  2. K. Niitsu, R. Kainuma. Phase equilibria in the Fe–La–Si ternary system. Intermetallics. 20 [1] (2012) 160-169 10.1016/j.intermet.2011.06.005
2011
  1. Kodai Niitsu, Toshihiro Omori, Ryosuke Kainuma. Superelasticity at Low Temperatures in Cu-17Al-15Mn (at%) Shape Memory Alloy. MATERIALS TRANSACTIONS. 52 [8] (2011) 1713-1715 10.2320/matertrans.m2011128
  2. K. Niitsu, T. Omori, M. Nagasako, K. Oikawa, R. Kainuma, K. Ishida. Phase transformations in the B2 phase of Co-rich Co–Al binary alloys. Journal of Alloys and Compounds. 509 [6] (2011) 2697-2702 10.1016/j.jallcom.2010.11.130

書籍 TSV

2024
  1. 新津 甲大. 形状記憶合金の弾性熱量効果. 革新的冷却技術. NTS, 2024, 7.

会議録 TSV

口頭発表 TSV

2023
  1. ICHIHARA, Fumihiko, MIYOSHI, Shogo, NIITSU, Kodai, 丹羽尉浩, MITSUISHI, Kazutaka, OHNO, Takahisa, ODE, Machiko, MASUDA, Takuya. Compatibility Study of LiCoO2 and LiCoPO4 Cathode Materials with NASICON-Type Solid Electrolyte LATP. 2023 MRS Fall Meeting. 2023
  2. HAN, Kwangsik, OHNUMA, Ikuo, LEE, Inho, NIITSU, Kodai, SAHARA, Ryoji, 貝沼 亮介. Formation behavior of Γ phase in the early stage of solid/liquid interfacial reaction between Fe and molten Zn at 450 °C. GALVATECH 2023. 2023
  3. 新津 甲大, 貝沼 亮介. 熱弾性型マルテンサイト変態の低温ダイナミクス. 日本金属学会 2023年(第173回)秋期講演大会. 2023 招待講演
  4. NIITSU, Kodai. A new concept of viscosuperelasticity for thermally activated martensitic transformations. Workshop on Metastability from an Interdisciplinary Perspective. 2023
  5. NIITSU, Kodai. Viscosuperelasticity: a new concept of sluggish dynamics of martensitic transformations. Symposium and Workshop on “Advanced Thermodynamics and Metastability”. 2023
  6. NIITSU, Kodai. Determination of magnetic exchange stiffness by measuring magnetic domain wall width. International Union of Microbeam Analysis Societies Joint with the Annual Microscopical Society of Canada and FIB SEM Meetings . 2023
  7. NIITSU, Kodai. Magnetic configurations of a skyrmionic vortex stabilized in FeGe nanoparticles. Japan-Canada Joint Seminar on Advanced Electron Microscopy and its Application (4th Canada - Japan Microscopy Societies Symposium 2023). 2023
  8. 平田研二, 豊福 朋也, 山田 浩志, アンガライニ スリアユ, 新津 甲大, 上原 雅人, 秋山 守人. MgとWを同時添加したAlN薄膜の作製. 第70回応用物理学会春期学術講演会. 2023
  9. 新津 甲大. 磁壁幅計測を通した磁気交換スティフネスの決定法. 第70回応用物理学会春期学術講演会. 2023
2022
  1. ICHIHARA, Fumihiko, NIITSU, Kodai, MIYOSHI, Shogo, MITSUISHI, Kazutaka, MASUDA, Takuya. Structural Analysis of LiCoPO4 electrode/ NASICON-Type Li1.3Al0.3Ti1.7(PO4)3 Solid Electrolyte Interface. 242nd ECS Meeting. 2022
  2. 新津 甲大, 矢野凱己, 貝沼亮介, 乾晴行. 熱活性化機構に基づくマルテンサイト変態の等温ダイナミクスと非エルゴード性の理解. 2022年秋期(第171回)講演大会. 2022
  3. ICHIHARA, Fumihiko, NIITSU, Kodai, MIYOSHI, Shogo, MITSUISHI, Kazutaka, MASUDA, Takuya. XAFS and TEM/EELS Analysis of Electrode/Oxide-based Solid Electrolyte Interface. THE 22ND INTERNATIONAL VACUUM CONGRESS. 2022
  4. 花咲徳亮, 小田昌治, 古谷大樹, 新津 甲大, 陳正昊, 江原和輝, 村川寛, 酒井英明, 仁谷浩明, 阿部仁, 佐賀山基, 乾晴行. ミディアムエントロピー合金における局所構造. 日本金属学会 2022年春期第170回講演大会. 2022 招待講演

その他の文献 TSV

公開特許出願 TSV

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