Activity Measurements of Liquid Sb-In Alloys by E.M.F. Method Using Zirconia Solid and Fused Salt Electrolytes

Abstract

The values of emf of the galvanic cells involving zirconia solid and fused salt electrolytes have been measured in order to obtain the standard free energy of formation of In₂O₃ in the temperature range from 875 to 1275 K and the thermodynamic data of the liquid Sb-In system for N_In=0.10-0.90 and N_In=0.15-0.90, in the temperature ranges from 880 to 1272 and from 943 to 1200 K, respectively. The cells used were as follows:
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The standard free energy of formation of In₂O₃ was determined as the following equation:
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Activities of indium and antimony by both galvanic cell methods show negative deviations from Raoult’s law over the whole concentration range and a_{In values agree} well with the data measured by Niwa et al. and the others but differ from those of Terpilowski. The peak value of the heat of mixing by emf method using zirconia solid electrolytes is −3.88 kJ/mol at about N_In=0.56.