研究者詳細 - 小山　佳一

論文 - 小山　佳一

分割表示 487 件中 81 - 100 件目／全件表示 >>

T. Wakamori, Y. Mitsui, K. Takahashi, R.Y. Umetsu, M. Hiroi, K. Koyama . High Field X-ray Diffraction Measurements of Mn2Sb0.95Ge0.05 . AIP Conf. Proc. 1763 0020006 2016年8月査読

K. Ozono, Y. Mitsui, R. Y. Umetsu, M. Hiroi, K. Takahashi, K. Koyama . Magnetic and Structural Properties of MnCo1-xFexGe (0 ≤ x ≤ 0.12) . API Conf. Proc.1763 002003 2016年8月査読

K. Ozono, Y. Mitsui, M. Hiroi, R.Y. Umetsu, K. Takahashi, K. Matsubayashi, Y. Uwatoko, K. Koyama . Magnetic and Structural Properties of Metamagnetic MnCo0.92Fe0.08Ge Compound . Mater. Trans.57 ( 3 ) 316 - 320 2016年3月査読

小野寺礼尚、大武和樹、高橋弘紀、木村尚次郎、渡辺和雄、小山佳一 . 高温・強磁場中磁化測定によるFeRh合金のメタ磁気相転移の観測 . 日本金属学会誌80 ( 3 ) 186 - 191 2016年3月査読

Y. Mitsui, K. Abematsu, R.Y. Umetsu, K. Takahashi, K. Koyama . Magnetic field effects on liquid-phase reactive sintering of MnBi . J. Magn. Magn. Mater.400 304 - 306 2016年1月査読

Ozono K., Mitsui Y., Umetsu R., Hiroi M., Takahashi K., Koyama K. . Magnetic and Structural Properties of MnCo<inf>1-x</inf>FexGe (0 ≤ x ≤ 0.12) . AIP Conference Proceedings1763 2016年査読

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：AIP Conference Proceedings

Structural, magnetic and thermal properties of ferromagnetic MnCo1-xFexGe (0 ≤ x ≤ 0.12) compounds were investigated. The Curie temperature TC and the martensitic transformation temperature TM of MnCoGe (x = 0) were determined to be 340 K and 510 K, respectively. With increasing x from 0 to 0.08, TM decreased and reached room temperature (290 K) for x ∼ 0.08. For x > 0.09, MnCo1-x Fex Ge did not exhibit the martensitic transformation. The compound for x ∼ 0.08 showed a first-order magnetic transition with a thermal hysteresis of 20 K and was accompanied by the martensitic transformation in the vicinity of room temperature. The phase diagram of MnCo1-x Fex Ge (0 ≤ x ≤ 0.12) is presented.

DOI： 10.1063/1.4961336

Web of Science

Scopus

S. Yoshinaga, Y. Mitsui, R.Y. Umetsu, K. Koyama . Magnetic properties of Cr-based ternary compound CrAlGe . Physics Procedia75 918 - 925 2015年12月査読

Y. Mitsui, Y. Yoshimine, R.Y. Umetsu, K. Matsubayashi, Y. Uwatoko, M. Hiroi, K. Koyama . Pressure Effect on the Martensitic Transformation and Magnetic Properties of Mn2−xNi1+xGa . 鹿児島大学理学部紀要48 35 - 39 2015年12月

K. Koyama, D. Shimada, Y. Adachi, H. Orihashi, D. Mitsunaga, M. Hiroi, Y. Mitsui, S. Kimura, K. Matsubayashi, Y. Uwatoko . Magnetic and electrical properties of Mn2Sb1−xZx (Z = Ge, Sn) under high pressures and high magnetic fields . Rep. Fac. Sri., Kagoshima Univ.48 15 - 21 2015年12月

D. Miyazaki, Y. Mitsui, K. Abematsu, K. Takahashi, K. Watanabe, S. Uda, K. Koyama . In-situ observation and differential thermal analysis of MnBi in high magnetic fields . Physics Procedia75 1324 - 1331 2015年12月査読

R. Onodera, S. Kimura, K. Watanabe, Y. Yokoyama, A. Makino, K. Koyama . Nucleation control for fine nano crystallization of Fe-based amorphous alloy by high-magnetic-field annealing . J. Alloys Comp.637 213 - 218 2015年7月査読

Y. Mitsui, Y. Ikehara, K. Takahashi, S. Kimura, G. Miyamato, F. Furuhara, K. Watanabe, K. Koyama . Fe-Fe3C binary phase diagram in high magnetic fields . J. Alloys Comp.632 251 - 255 2015年3月査読

Yoshifuru Mitsui, Yuki Yoshimine, Rie Y. Umetsu, Kazuyuki Matsubayashi, Yoshiya Uwatoko, Masahiko Hiroi, Keiichi Koyama . Pressure Effect on the Martensitic Transformation and Magnetic Properties of Mn2-xNi1+xGa . 鹿児島大学理学部紀要48 35 - 39 2015年

Goto J., Kakimoto T., Fujii S., Koyama K. . Site Preference and Stabilization of Antiferromagnetism in M-Substituted Mn₂₋xMxSb (M = Ti, Cr, Co, or Cu) . MATERIALS TRANSACTIONS56 ( 3 ) 415 - 423 2015年査読

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人日本金属学会

We applied first-principles total-energy calculations to several compounds Mn2-xMxSb (M = Ti, Cr, Co, or Cu) to calculate the total energy. The results indicate that the Ti and Cu (Cr and Co) atoms prefer the Mn(II) site to the Mn(I) site [Mn(I) to Mn(II)]. These results are consistent with experimental observations. The antiferromagnetism (AF) [ferrimagnetism (FR)] is more stable than FR (AF) upon decreasing (increasing) the distance between the Mn(II) and Sb atoms in the z direction in all Mn2-xMxSb systems. This result indicates that the environment around the Mn atom plays a very important role in the stabilization of the AF state, as is the case with Mn2Sb1-xAsx systems. For Mn2-xCoxSb systems, the atomic disorder between the Mn and Co atoms is insensitive to the relative stability of two magnetic phases AF and FR.

DOI： 10.2320/matertrans.m2014417

Web of Science

Scopus

小山佳一, 五十嵐利行, 渡辺和雄 . HfV2の強磁場と高圧下における磁気的,熱伝的及び構造的特性 . 鹿児島大学理学部紀要47 13 - 19 2014年12月

T. Kakimoto, J. Goto, S. Fujii, K. Koyama and S. Ishida . Electronic and magnetic properties of Mn2Sb1-xAsx (x = 0, 0.5, 1) . Mater. Trans. 55 ( 12 ) 1878 - 1884 2014年12月査読

Y. Mitsui, R.Y. Umetsu, K. Koyama and K. Watanabe . Magnetic-field-induced enhancement for synthesizing ferromagnetic MnBi phase by solid-state reaction sintering . J. Alloys Comp.615 131 - 134 2014年12月査読

T.M. Pan,C.H. Chen, J.L. Her, K. Koyama . Comparison of structural and electrical properties of Lu2O3 and Lu2TiO5 gate dielectrics for alpha-InGaZnO thin-film transistors . J. Appl. Phys.116 ( 19 ) 194510 - -4 2014年11月査読

J.L. Her, T.M. Pan, J.H. Liu, H.J. Wang, C.H. Chen, K. Koyama . Electrical characteristics of GdTiO3 gate dielectric for amorphous InGaZnO thin-film transistors . Thin Solid Films569 6 - 9 2014年10月査読

Y. Mitsui, K. Koyama, K. Oikawa, K. Watanabe . Magnetic field effect on the liquid boundary of Bi-Mn binary system . AIP Conference Proceedings1618 269 - 272 2014年10月

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