Abstract

The modified KDP model of Wu on a compressible harmonic lattice is considered. An electric field and normal forces act on the system. The specific heats, mean lattice spacing, polarization and susceptibility are computed. Elasticity does not change the order of the transition, which remains of second order (without latent heat). The specific heat at constant volume is finite through the critical temperature, while the specific heat at constant force diverges at T + c. The dependence of the critical temperature on electric and force fields as well as the isotherms are discussed.

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