Abstract
The thermodynamic properties of the solid solutions formed by rhodium and nickel were investigated between 1100 and 1400K, using oxygen concentration cells with a ZrO 2CaO solid electrolyte. The activities of nickel show positive deviations from Raoult's law in the rhodium-rich alloys and small negative deviations in the nickel-rich alloys. The integral enthalpy of mixing and the excess integral entropy of mixing are positive. The thermodynamic data indicate that a miscibility gap may be expected at low temperatures.
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