Faculty Profiles - HASEGAWA, Masashi

Papers - HASEGAWA, Masashi

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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 Reviewed

M. Hasegawa and T. Yagi

J. Alloys and Compd. Vol. 403 page： 131-142 2005

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

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 Reviewed

M. Hasegawa, M. Takeuchi and A. Inoue

Acta Materialia Vol. 53 page： 5297-5304 2005

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

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 Reviewed

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 Vol. 144-147 page： 585-587 2005

Comparative study on glassy phase stability of Zr-Co-Al and Zr-Ni-Al metallic glasses Reviewed

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

Mater. Trans. Vol. 46 page： 2785-2790 2005

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

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

J. Phys. Cond. Matter Vol. 17 page： 7177-7184 2005

Free-Energy analysis of the Zr-Ni-Al bulk metallic glass from the local atomic arrangements of the relevant crystals Reviewed Open Access

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

Mater. Trans. Vol. 46 page： 2791-2798 2005

Hydrogen permeation and structural features of melt-spun Ni-Nb-Zr amorphous aloys Reviewed

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

Acta Materialia Vol. 53 page： 3703-3711 2005

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

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

J. Alloys and Compd. Vol. 397 page： 149-154 2005

Structural observation and RMC modeling for Cu-Zr and Ni-Zr metallic glasses Reviewed

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

J. Metastable Nanocryst. Mater. Vol. 24-25 page： 217-220 2005

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 Invited

長谷川正

東京大学物性研究所短期研究会資料 page： 21-22 2005

水素化による金属ガラスの高減衰能化 Invited

長谷川正

HDM2プレシンポジウムプロシーディングス page： 21-24 2005

金属ガラスの相安定性と電子論 Invited Reviewed

長谷川正

金属 Vol. 75 page： 101-106 2005

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

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

Acta Materialia Vol. 52 page： 1799-1806 2004

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

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

J. Phys. Cond. Matter Vol. 16 page： 7917-7930 2004

Damping properties of hydrogen-absorbed rod metallic glasses Reviewed

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

J. Alloys and Compd. Vol. 355 page： 37-41 2004

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

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

J. Alloys and Compd. Vol. 365 page： 223-229 2004

Stability and hydrogen-induced internal friction of Ti-rich multicomponent glassy alloys Reviewed

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

J. Alloys and Compd. Vol. 372 page： 116-120 2004

Unoccupied electronic state of delafossite-type PdCoO2 single crystal probed by inverse photoemission spectroscopy Reviewed

T. Higuchi, D. Baba, Y. Yokoyama, M. Hasegawa, H. Takei, A. Fukushima, T. Tsukamoto , S. Shin

Jpn. J. Appl. Phys. Vol. 43 page： 699-700 2004

Pressure effect on the antiferromagnetic transition temperature in CuFeO2 Reviewed

H. Takahashi, Y.Motegi, R.Tsuchigane and M. Hasegawa

J. Mag. Mag. Mater. Vol. 272-276 page： 216-217 2004

Mechanical properties and fracture characteristics of bulk metallic glass composites containing carbon nanotube addition Reviewed

Z. Bian, T. Zhang, H. Kato, M. Hasegawa, A. Inoue

J. Mater. Res. Vol. 19 page： 1068-1076 2004

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Papers - HASEGAWA, Masashi