研究者詳細 - 長谷川　正

論文 - 長谷川　正

分割表示 248 件中 121 - 140 件目／全件表示 >>

バルク金属ガラスZr-TM-Al (TM = Ni, Cu)の電子構造査読有り

鈴木孝治，宮崎秀俊，曽田一雄，竹内恒博，長谷川正，佐藤洋一，水谷宇一郎

粉体及び粉末冶金 53 巻頁： 107-110 2006年

電力・電気利用のための各種磁性材料における最近の動向招待有り

長谷川正

日本学術振興会材料と微細組織と機能性第１３３委員会第１９０回研究会資料頁： 1-7 2006年

Synthesis of Co2N by a simple direct nitriding reaction between nitrogen and cobalt under 10 GPa and 1800 K using diamond anvil cell and YAG laser heating 査読有り

M. Hasegawa and T. Yagi

Solid State Commun. 135 巻頁： 294-297 2005年

Systematic study of formation and crystal structure of 3d-transition-metal nitrides synthesized in a supercritical nitrogen fluid under 10 GPa and 1800 K using diamond anvil cell and YAG laser heating 査読有り

M. Hasegawa and T. Yagi

J. Alloys and Compd. 403 巻頁： 131-142 2005年

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

Syntheses of 3d-transition metal (Ti-Cu) nitrides have been tried in a supercritical nitrogen fluid at high pressures (about 10 GPa) and high temperatures (about 1800 K) using diamond anvil cell and YAG laser heating system. Nitrides, such as TiN, VN, CrN, Mn3N2, Fe2N, Co2N and Ni3N have been successfully synthesized easily by a simple direct nitriding reaction between metal and fluid nitrogen in a short time, while any Cu nitrides were not synthesized. These results indicate that the ratio of nitrogen to metal, N/M, of the nitride decreases from 1 to 0 with the sequence from the early transition metal nitrides to the late transition metal ones. The systematic change of the N/M ratio and crystal structure of the 3d-transition metal nitrides is discussed and interpreted on the basis of the electron arrangement of the 3d-transition metal which is relevant to its coordination number.

Effects of Pd addition on stability and hydrogen-induced internal friction of Ti34Zr11Cu47Ni8 glassy alloys 査読有り

M. Hasegawa, M. Takeuchi and A. Inoue

Acta Materialia 53 巻頁： 5297-5304 2005年

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

The effects of additions or Pd below 10 at.% on the stability and hydrogen-induced internal friction behavior of Ti34Zr11Cu47Ni8 glassy alloys have been investigated. Thermal analyses indicate that the Supercooled liquid region decreases distinctly with increasing Pd content. It was round that internal friction peak temperatures or Ti(34)Z(11)Cu(47)Ni(8)-Pd hydrogenated glassy alloys (HGAs) in the hydrogen content range below approximately 30 at.% H were higher than those of the original Ti34Zr11Cu47Ni8 FIGAs, especially at hydrogen contents below similar to 10 at.% H. It was also found that the internal friction peaks of Ti34Zr11Cu47Ni8-Pd HGAs increased with increasing hydrogen content below similar to 15 at% H, after which they tended to saturate. These results are in contrast to the effects of Si addition as previously reported. The effects of Pd are discussed from the viewpoint of the interstitial site distribution for hydrogen and local atomic structure of the glassy alloy.

Electronic structure of bulk metallic glass Zr55Al10Cu30Ni5 査読有り

K. Soda, K. Shimba, S. Yagi, M. Kato, T. Takeuchi, U. Mizutani, T. Zhang, M. Hasegawa, A. Inoue, T. Ito and S. Kimura

J. Electron Spectroscopy Related Phenomena 144-147 巻頁： 585-587 2005年

Comparative study on glassy phase stability of Zr-Co-Al and Zr-Ni-Al metallic glasses 査読有り

M. Hasegawa, T. Taketomi, H. Kato, T. Takeuchi, U. Mizutani and A. Inoue

Mater. Trans. 46 巻頁： 2785-2790 2005年

Synthesis and magnetic and electronic poperties of metastable non-stoichiometric ThCr2Si2-type ternary Ce-Ni-Ge compound 査読有り

M. Hasegawa, S. Suzuki, N. Yoneyama, A. Inoue and N. Kobayashi

J. Phys. Cond. Matter 17 巻頁： 7177-7184 2005年

Free-Energy analysis of the Zr-Ni-Al bulk metallic glass from the local atomic arrangements of the relevant crystals 査読有り

T. Takeuchi, S. Nakano, M. Hasegawa, K. Soda, H. Sato, U. Mizutani, K. Itoh, T. Fukunaga

Mater. Trans. 46 巻頁： 2791-2798 2005年

Hydrogen permeation and structural features of melt-spun Ni-Nb-Zr amorphous aloys 査読有り

S. Yamaura, M. Sakurai, M. Hasegawa, K. Wakoh, Y. Shimpo, M. Nishida, H. Kimura, E. Matsubara and A. Inoue

Acta Materialia 53 巻頁： 3703-3711 2005年

Amorphous phase formation, crystallization process and metastable phase of La5M35Ge60 (M=Mn, Fe, Co, Ni, Cu, Pd) ternary alloys 査読有り

M. Hasegawa, S. Suzuki, T. Taketomi and A. Inoue

J. Alloys and Compd. 397 巻頁： 149-154 2005年

Structural observation and RMC modeling for Cu-Zr and Ni-Zr metallic glasses 査読有り

D. Toraya, K. Ito, T. Otomo, K. Mori, H. Kato, M. Hasegawa and T. Fukunaga

J. Metastable Nanocryst. Mater. 24-25 巻頁： 217-220 2005年

YAGレーザー加熱DACによる高圧超高温超臨界窒素流体を用いた金属窒化物の創成招待有り

長谷川正

東京大学物性研究所短期研究会資料頁： 21-22 2005年

水素化による金属ガラスの高減衰能化招待有り

長谷川正

HDM2プレシンポジウムプロシーディングス頁： 21-24 2005年

金属ガラスの相安定性と電子論招待有り査読有り

長谷川正

金属 75 巻頁： 101-106 2005年

Effects of a small amount of Si or Ge addition on stability and hydrogen-induced internal friction of Ti34Zr11Cu47Ni8 glassy alloys 査読有り

M. Hasegawa, M. Takeuchi, H. Kato and A. Inoue

Acta Materialia 52 巻頁： 1799-1806 2004年

The crystal structure and electronic properties of a new metastable non-stoichiometric BaAl4-type compound crystallized from amorphous La6Ni34Ge60 alloy 査読有り

M. Hasegawa, S. Suzuki, T. Ohsuna, E. Matsubara, S.Endo and A. Inoue

J. Phys. Cond. Matter 16 巻頁： 7917-7930 2004年

Damping properties of hydrogen-absorbed rod metallic glasses 査読有り

M. Hasegawa, S. Yamaura, H. Kato, K. Amiya, N. Nishiyama and A. Inoue

J. Alloys and Compd. 355 巻頁： 37-41 2004年

Hydrogen-induced internal friction of Zr-based bulk glassy alloys in a rod shape above 90 K 査読有り

M. Hasegawa, K. Kotani, S. Yamaura, H. Kato, I. Kodama and A. Inoue

J. Alloys and Compd. 365 巻頁： 223-229 2004年

Stability and hydrogen-induced internal friction of Ti-rich multicomponent glassy alloys 査読有り

M. Hasegawa, M. Takeuchi, H. Kato, S. Yamaura and A. Inoue

J. Alloys and Compd. 372 巻頁： 116-120 2004年

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