Abstract
AbstractThe thermodynamic properties of Cu‐Y alloys were determined between 973 and 1073 K by emf measurements on galvanic cells using CaF2 single crystals as solid electrolytes. Results yield a complete set of thermodynamic functions for the intermetallic phases (Cu), Cu6Y, Cu4Y, Cu7Y2, Cu2Y, and CuY, as well as information on the phase relations. The system is characterized by moderate negative deviations from ideality. A comparison with analogous systems indicates the influence of the electronic structure of the components on thermodynamic functions. The phase relations of the Cu‐Y system were additionally investigated by DTA and X‐ray diffraction.The present results as well as literature data on the thermodynamics and phase diagram of the Cu‐Y system were used as a basis for a thermodynamic optimization of the system using a computer program based on the least squares method. Optimized and experimental data turned out to be in good agreement.
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