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Citation: Zhang Yu-Fen, Hou Yong, Wang Jian, Hong Cun-Mao. Crystal Structure and Hydrogen Absorption Properties of MmB₅ Alloys[J]. Acta Physico-Chimica Sinica, ;1994, 10(07): 644-647. doi: 10.3866/PKU.WHXB19940713 shu

Crystal Structure and Hydrogen Absorption Properties of MmB₅ Alloys

1.
Department of Chemistry, Peking University, Beijing 100871

Received Date: 5 February 1993
Available Online: 15 July 1994

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 hexa nal 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.
- Metalhydride,
- Electrode materials,
- X-ray diffraction,
- P-C Isotherms
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Crystal Structure and Hydrogen Absorption Properties of MmB5 Alloys

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通讯作者: 陈斌, bchen63@163.com

Crystal Structure and Hydrogen Absorption Properties of MmB₅ Alloys