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Structural and Hydriding/Dehydriding Properties of HoMn2Hx with Cubic and Hexagonal Laves Phase Structure

Published online by Cambridge University Press:  01 February 2011

Yoshikazu Makihara ,
Youichi Iwata ,
Kazumi Umeda ,
Yoshio Miyairi  and
Hironobu Fujii
Yoshikazu Makihara
Affiliation:
makihara@kyukyo-u.ac.jp, Kyushu Kyoritsu University, Mechanical and Electronic System Engineering, 1-8 Jiyugaoka, yahatanishi-ku, Kitakyushu, N/A, 807-8585, Japan
Youichi Iwata
Affiliation:
04a7102@edu.cc.kyukyo-u.ac.jp, Kyushu Kyoritsu University, Department of Mechanical and Electronic System Engineering, 1-8 Jiyugaoka, Yahatanishi-ku, Kitakyushu, N/A, 807-8585, Japan
Kazumi Umeda
Affiliation:
04a7701@edu.cc.kyukyo-u.ac.jp, Kyushu Kyoritsu University, Department of Mechanical and Electronic System Engineering, 1-8 Jiyugaoka, Yahatanishi-ku, Kitakyushu, N/A, 807-8585, Japan
Yoshio Miyairi
Affiliation:
miyairi@kyukyo-u.ac.jp, Kyushu Kyoritsu University, Department of Mechanical and Electronic System Engineering, 1-8 Jiyugaoka, Yahatanishi-ku, Kitakyushu, N/A, 807-8585, Japan
Hironobu Fujii
Affiliation:
hfujii@hiroshima-u.ac.jp, Hiroshima University, Natural Science Center for Basic Research and Development, 1-3-1 Kagamiyama, Higashi-Hiroshima, N/A, 739-8526, Japan
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Abstract

Both the cubic C15-type and the hexagonal C14-type Laves phase compounds HoMn2 were successfully prepared. We found that they absorbed hydrogen up to 3.4 atoms per formula unit at room temperature and discharged it at around 490 K, reversibly. Structural and hydriding/dehydriding properties of the host HoMn2 and their hydrides HoMn2Hx have been investigated by powder X-ray diffraction (XRD) and thermogravimetry/differential thermal analysis (TG/DTA). With increasing the hydrogen content, the host C15-type HoMn2 is distorted into a rhombohedral phase at above x = 2.9, while the host C14-type one keeps the hexagonal structure up to x = 3.4. The experimental results obtained from TG/DTA measurement suggest that two possible interstitial sites with different activation energies for hydrogen desorption exist in the C14 HoMn2, while one site in the C15 HoMn2.

Keywords

hydrogenationstructuraldifferential thermal analysis (DTA)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 927: Symposium EE – Hydrogen Storage Materials , 2006 , 0927-EE03-09
Copyright
Copyright © Materials Research Society 2006

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