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The phase structures and the electrochemical properties of casting alloys Gd(Mn1-xNix)2 (x=0.06, 0.5, 0.7, 0.8, 1.0) were investigated systematically. The results show that the alloy x=0.06 consists of a major phase GdMn2 and a secondary phase Gd6Mn23 and the alloys Gd(Mn1-xNix)2 (x=0.5, 0.7, 0.8) contain four phases GdMn2, Gd6Mn23, GdNi and GdMnNi. The electrochemical analysis shows the alloys (x=0.5, 0.7, 0.8, 1.0) exhibit more stable discharge capacities of 308, 273, 248 and 250 mAh·g-1, respectively. The alloy x=0.5 which contains higher relative content of GdMnNi than others exhibits the highest discharge capacity and the best cyclic durability.
The results show that the alloy x = 0.06 consists of a major phase GdMn2 and (x, y) The secondary phase Gd6Mn23 and the alloys Gd (Mn1-xNix) 2 (x = 0.5, 0.7, 0.8) contain four phases GdMn2, Gd6Mn23, GdNi and GdMnNi. The electrochemical analysis shows the alloys (x = 0.5, 0.7, 0.8, 1.0 The alloy x = 0.5 which contains higher relative content of GdMnNi than others exhibits the highest discharge capacity and the best cyclic durability.