<正> LaNi_5是一个性能良好、具有使用价值的吸氢材料。为了降低它的成本,用混合稀土金属代替La,国内外都做了一些工作,但从相图角度,弄清楚MmNi_5的相关系以及MmNi_5的组成对其性能的影响的研究尚不多,也欠系统。我们曾进行了LaNi_5-CeNi_5,LaNi_5-NdNi_5,LaNi_5-LaCu_5系相图及其吸氢性能的研究。本文主要研究混合稀土金属的相关系,MmNi_5的相结构及组成对吸氢性能的影响。
X-ray diffraction, DTA and other methods were used to determine the phase relations between native mischmetal (Mm) and MmNi_5 as well as the phase diagram of LaNi_5-PrNi_5 pseudo-binary system. The hydrogen desorption capacities and hydrogen adsorption plateau pressure of LaNi_5-PrNi_5 (CeNi_5, NdNi_5) system varied with the compositions of specimens and the hydrogen absorption properties of La-rich and Ce-rich MmNi_5 were also studied. The free energy, △Z, the enthalpy, △H, and the entropy, △S, of the hydride of La-rich MmNi_5 were estimated to be 6.14 kJ/mol H_2,-20.92 kJ/mol H_2 and-90.8 J/K.mol H_2 respectively.
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