Calculation of Volume Paramagnetostriction for Pd–Rh, Ni–Rh and Pt–Ni Alloys

Abstract

The volume paramagnetostriction of disordered alloys is calculated in the itinerant electron model. By assuming transfer energys and the number of d-electrons to vary with volume change, a general expression for the volume dependence of spin paramagnetic susceptibility is derived from the results for the spin paramagnetic susceptibility of a disordered binary alloy which is obtained in the coherent potential approximation and the t-approximation for the electron correlation. Numerical estimations of the spin paramagnetic susceptibility and its volume dependence are given for Pd–Rh, Ni–Rh and Pt–Ni alloys and a good agreement with experiments is obtained. It is found that a volume dependence of the transfer energy or the bandwidth has a main effect on the volume paramagnetostriction.