Abstract
In recent papers, the modified model by P. Weiss was applied to ferroelectrics. Typical ferroelectric properties could be simulated. A further generalization of the Weiss model is the assumption of a power law feedback with an exponent κ between the polarization of the permanent dipoles and the local field. For different values of κ we could simulate first-order, second-order and diffusive-type phase transitions. In this paper we investigate in detail the influence of an external field on the first order ferroelectric phase transition. To contrast this result we also report on the effect of an external field on second order and diffusive type phase transitions.
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