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Synthesis of Ti-Zr-Ni amorphous and quasicrystal powders by mechanical alloying, and their electrochemical properties

Published online by Cambridge University Press:  31 January 2011

Akito Takasaki ,
Tetsuya Okuyama  and
Janusz S. Szmyd
Akito Takasaki*
Affiliation:
Department of Engineering Science and Mechanics, Shibaura Institute of Technology, Toyosu, Koto-ku, Tokyo 135-8548, Japan
Tetsuya Okuyama
Affiliation:
Graduate School, Shibaura Institute of Technology, Toyosu, Koto-ku, Tokyo 135-8548, Japan
Janusz S. Szmyd
Affiliation:
Faculty of Fuels and Energy, AGH–University of Science and Technology, Krakow 30059, Poland
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Mechanical alloying of Ti45Zr38–xNi17+x and Ti45–xZr38Ni17+x (0 ≤ x ≤ 8) elemental powders produced an amorphous phase, but subsequent annealing converted the amorphous phase into an icosahedral quasicrystal phase, along with a Ti2Ni-type phase. The discharge capacities, measured in a three-electrode cell at room temperature for both the amorphous and quasicrystal electrodes, increased with increasing Ni substitution for Zr or Ti. The highest discharge capacities, which were about 60 mAh/g for the amorphous electrode and 100 mAh/g for the quasicrystal electrode, were obtained from (Ti45Zr30Ni25) after substitution of Ni for Zr. For the Ti45Zr30Ni25 composition, the discharge performance of the quasicrystal electrode was stable over charge/discharge cycling, but that of the amorphous electrode gradually decreased with cycling. The structure of the quasicrystal phase in the electrodes was stable, even after 15 charge/discharge cycles, but the amorphous phase converted to a (Ti, Zr)H2 f.c.c. hydride.

Keywords

AmorphousQuasicrystalPowder metallurgy
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 8: Materials for Electrical Energy Storage , August 2010 , pp. 1575 - 1582
Copyright
Copyright © Materials Research Society 2010

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References

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