摘要
使用以稳定的ZrO2为电解质的高温固体电解质电池电动势方法测量了Ni3Ga非整比金属间化合物1073至1273K均相范围内Ga的活度，计算了偏摩尔焓和偏摩尔摘等热力学性质．考虑4种点缺陷，即分别在2个亚晶格上的反结构原子和空位共存于该Ll2型化合物中，各缺陷生成自由能为可调参数：Ef（Aβ）＝0．60eV，Ef（Bα）＝0．60eV，EfV（α）＝1．5eV，EfV（β）＝2．0eV，用统计热力学方法推导了Ni3Ga非整比化合物均相范围内缺陷浓度及其与温度和成分的关系，得到1123K时整比处的无序参数a’＝0．0009．
Thermodynamic activities of gallium were measured between 1073 and 1 273 K in the nonstoichiometric intermetallic compound Ni3Ga using an emf-method based on solid oxygen-conducting electrolytes. The partial molar enthalpies and entropies were derived from their dependence on temperature. The results of the activity measurements were interpreted in terms of a statistical-thermodynamic model for nonstoichiometric phases with the cubic Ll2-superstructure considering four types of point defects, i. e- antistructure atoms and vacancies on the nickel- and gallium-sublattice. The enerpies of formation of the point defects at the stoichiometric composition are used as adjustable parameter.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2000年第3期202-204,共3页
Journal of University of Science and Technology Beijing
基金
国家自然科学基金!29871005
奥地利科学基金联合资助!P12962-CHE
