Abstract
The vapor pressure of indium over five solid, binary nickel-indium alloys was measured by the method of atomic absorption spectroscopy. The alloys exist in ≡, ζ′, ϵ, γ, and ϵ + γ phases of the nickel-indium system in the temperature range of this study. The thermodynamic activity, partial molar enthalpy and partial molar entropy of indium were calculated from the vapor pressure and the temperature coefficients. The results are compared with previous work on α and ζ phases of the nickel-indium system. It is found that the criterion of equality of chemical potential for coexisting phases is obeyed and thus the accuracy of activity measurements in these phases is confirmed.
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