Synergistic effect between Laves phase and Zr-Ni phases in Zr(MnVNi)2 hydrogen storage alloys
来源期刊：中国有色金属学报(英文版)1999年第3期
论文作者：张文魁 马淳安 杨晓光 雷永泉 王启东
文章页码：505 - 509
Key words：annealing treatment; hydrogen storage alloys; crystal structure; electrochemical properties;synergistic effect
Abstract: The effect of annealing treatment on the crystal structure and electrochemical properties of Zr (Mn0.25V0.20Ni0.55)2 and Zr(Mn0.05V0.40Ni0.55)2 hydrogen storage alloys was investigated by means of XRD analysis and electrochemical tests. The results of XRD analysis showed that the as-cast alloys consist of C15, C14 type Laves phase and Zr9Ni11 and ZrNi phases. The composition of alloys homogenized after annealing treatment. The C15 type Laves phase is still stable while the Zr9Ni11 and ZrNi phases decompose and C14 phase disappears partially. The final stable structure of the alloys was a mixture phase of C15 and C14 type Laves phases. The results of the electrochemical tests showed that the discharge capacity and the properties of activation as well as high-rate dischargeability are all decreased after annealing treatment. The exchange current density decreases in some degree too.
