Ni-Sb二元合金的相关系与热力学性质的研究

Thermodynamic Study and Phase Relations of Ni-Sb System

利用非等温等蒸气压法研究了Ni Sb二元合金的相关系 ,确定了Ni5Sb2 和γ NiSb的相边界。当温度高于 715℃时Ni Sb体系中不存在Ni3Sb相 ,只有Ni5Sb2 相存在 ,Ni5Sb2 的相边界是 (原子分数 ) 2 9.42 %～ 3 1.6%Sb ,γ NiSb的相边界为 (原子分数 ) 5 0 .2 %～ 5 2 .5 8%Sb。测定了非化学计量金属间化合物Ni5Sb2 和γ NiSb非化学计量范围内Sb的活度 。

The phase relations of the binary Ni Sb system were studied and the phase boundaries of the Ni 5Sb 2 and γ NiSb were determined by pseudo isopiestic method. There is no Ni 3Sb (temperature >715 ℃) and only Ni 5Sb 2 exists in the Ni Sb system. The phase boundaries of the Ni 5Sb 2 and the γ NiSb phase are 29.42%～31.6%Sb and 50.2%～52.58%Sb, respectively. Activities, partial molar enthalpies and partial molar entropies of antimony in non stoichiometric Ni 5Sb 2 and γ NiSb phases were also calculated.