【摘要】 本文采用X射线衍射Rietveld全谱拟合分析研究了AB2型Laves相贮氢合金Zr（Mn0.45-xVxNi0.55）2（x＝0．10-0.40）的相组成和相含量Rietveld拟合分析结果表明，Zr（Mn0.45-xVxNi0.55）2合金由C15，C14型Laves相和Zr9M11，ZrM等非Laves相组成，Laves相和ZX9M11相在整个成分范围内存在，而ZrM相仅在x＝0.20—0.40范围内出现，当x＝0．05—0.15时，合金由C15，C14和Zr9M11相组成，其中C15型Laves相为主相；当x＝0．20—0．40时．合金则由C15；C14型Laves相及Zr9M11，ZrM相组成，主相则为C15和C14混合相,非Laves相中，Zr9M11相含量在整个成分范围内变化不大，而ZrM相含量则波动较大实验结果表明，各相的晶格参数均随合金中V含量的增加而增大，V取代Mn导致各相晶格体积膨胀计算表明，Laves相的出现类型与合金外层电子浓度有关.更多还原

【Abstract】 The phase component and abundance in Zr(Mn0.45-xNi0.55)2 (x=0.10-0.40)Laves phase hydrogen storage alloy were investigated by X-ray multiphase Rietveld analysis. The results of Rietveld analysis showed that all the alloys were composed of C15, C14 type Laves phase and the residual phases such as Zr9M11 and ZrM phase. Laves phase and Zr9M11 phase existed in the studied composition range, however, ZrM phase only appeared in the range of x=0.20-0.40. When x=0.05 - 0.15, the alloys consisted of C15, C14 and Zr9 M11 phase, in which the main phase was of C15 type. At x=0.20-0.40, the alloys consisted of C15, C14, Zr9 M11 and ZrM, in which the main phase was the mixture of C15 and C14 phase. The phase abundance of Zr9 M11 had a little variation in the whole range, however, that of ZrM phase showed a bigger fluctuation. The lattice parameters of each phase appeared in alloys showed a tendency to increase as V content increases. On the basis of the calculation of averaged numbers of outer electrons, the occurrence of Laves phase was found to have correlation with electron factors.更多还原