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Acta Physico-Chimica Sinica  1994, Vol. 10 Issue (07): 644-647    DOI: 10.3866/PKU.WHXB19940713
Note     
Crystal Structure and Hydrogen Absorption Properties of MmB5 Alloys
Zhang Yu-Fen, Hou Yong, Wang Jian, Hong Cun-Mao
Department of Chemistry, Peking University, Beijing 100871
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Abstract  

Pressure composition isotherms, crystal structures and electrochemical capacities of MmB_5 alloy-hydrogen systems have been investigated, where Mm represents La-rich mischmetals and B_5 take a composition of Ni_(3.8)Co_(0.5)Mn_(0.4)Al_(0.3). All these multicomponent alloys belong to CaCu_5-type hexagonal crystal structuxe. The volume of unit cell (or say, the interstitial hole size) becomes larger with increasing of La content and decreasing of Ce content in Mm. The larger interstitial hole leads to a decrease of dissociation pressure of their hydride, hence improves the stability of MmB_5H_6 and the electrochemical capacity of the MmB_5 alloy. The expansion ratio of the MmB_5 for hydrogen absorption was obviously smaller than that of LaNi_5 alloy. For MmB_5 alloy, especially with high content of La in Mm, a lot of properties for the application in MH/Ni battery, such as against pulverization, long cycle lifetime etc can be promoted.



Key wordsMetalhydride      Electrode materials      X-ray diffraction      P-C Isotherms     
Received: 05 February 1993      Published: 15 July 1994
Corresponding Authors: Hong Cun-Mao   
Cite this article:

Zhang Yu-Fen, Hou Yong, Wang Jian, Hong Cun-Mao. Crystal Structure and Hydrogen Absorption Properties of MmB5 Alloys. Acta Physico-Chimica Sinica, 1994, 10(07): 644-647.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB19940713     OR     http://www.whxb.pku.edu.cn/Y1994/V10/I07/644

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