CRYSTAL STRUCTURE AND PHASE ABUNDANCE OF Zr-Mn-Ni LAVES PHASE HYDROGEN STORAGE ALLOYS

来源期刊：中国有色金属学报(英文版)1997年第4期

论文作者：Zhang Wenkui Yang Xiaoguang Lei Yongquan Wang Qidong Lu Guanglie

文章页码：53 - 57

Key words：Rietveld method ;Laves phase ;Zr-Mn-Ni alloy ;crystal structure ;phase abundance

Abstract: The crystal structure and phase abundance of Zr(Mn₁-_xNi_x)₂( x=0.40～0.75) Laves phase hydrogen storage alloys were investigated by means of X ray powder diffraction Rietveld method. It was found that Mn site of ZrMn₂ alloy was partially substituted by Ni. The main phase structure of Zr-Mn-Ni alloy was of C15 type Laves phase. Ni element was considered to be a C15-stabilized element in ZrMn₂ alloy. Over the studied composition range, the alloys were composed of Laves phases and some residual phases ZrM_x . Laves phases including C15 and C14 type occurred over the studied composition range. The residual phases ZrM, Zr₉M₁₁ and Zr₇M₁₀ only appeared in a particular composition range. The lattice parameters and phase abundance of Laves phases changed with Ni concentration in alloys. The calculation of ANOE indicates that the occurrence of Laves phase in Zr(Mn₁-_xNi_x)₂ alloys is influenced by electron factors.