Measurement of Activity of Gallium in Liquid Ga–In–Bi Alloys Using Stabilized Zirconia as the Solid Electrolyte

抄録

EMF of galvanic cells with stabilized zirconia solid electrolyte was measured to determine the activity of gallium in liquid Ga–In–Bi alloys in the temperature range from 1050 to 1200 K along three pseudobinary lines of (In_yBi_1−y)–Ga where y=0.25, 0.50 and 0.75. A mixture of Ga and Ga₂O₃ was used as the reference electrode. The activity curves of Ga show positive deviations from ideality in the whole composition range. Iso-activity curves at 1073 K in the ternary Ga–In–Bi alloys were derived by combining the results of this study with activity data for Ga–In and Ga–Bi alloys. The iso-activity curves display small waves, and have concave curvatures in the Ga-rich region at lower temperatures. Using Darken’s equation, data for two binary systems Ga–In and Ga–Bi, and ternary data determined in this study, ΔG^XS at 1073 K was derived. The results are compared with those from the general model calculation proposed by Chou.