Abstract
Thermodynamic activity of Ga in the L12-ordered intermetallic phase Ni3Ga has been determined by measuring the electromotive force of a galvanic cell with zirconia solid electrolyte,Ni-Ga, Ga2O3|ZrO2(+Y2O3)|Ga, Ga2O3\ oindentin the temperature range of 1050-1350 K for six compositions. The activity of Ga varies with composition most steeply at the stoichiometry composition (25%Ga). The dependence on composition is more pronounced at low temperatures. The effective pair interaction energy has been determined to be 9.75±0.19 kJ/mol by applying a thermodynamic model based on Bragg-Williams approximation (Ikeda et al., Acta. Mater., 46 (1998), 6605-6613). The thermodynamic factor in diffusion has been derived from the composition dependence of the thermodynamic activity.
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