Abstract
The model Hamiltonian formulated by Pytte and Feder (1969) and later by Gillis and Koehler (1973-74) for describing a second-order displacive phase transition has been utilised to describe the phase transitions of dilute crystals whose active atoms remain unaltered as a result of mixing. The effect of dilution has been taken into account through a weighted and uniform mixing of the harmonic and anharmonic part of the potential of the two-component crystals. The soft-mode contributions to the specific heat of pure and dilute crystals have been calculated using the model Hamiltonian. Variations of transition temperature of the mixed crystals with composition have been computed using different values for the potential coefficients. The results obtained agree qualitatively with the general behaviour of mixed crystals having second-order displacive phase transitions.
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