A continuum model for ferroelectric materials is presented where the spontaneous polarization is treated as an
order parameter. The classic electric enthalpy consisting of elastic, dielectric and ferroelectric terms is extended
by a phase separating potential and an interface energy which yields a phase field potential. The coupled material
equations and the Ginzburg-Landau type evolution equation are derived from that phase field potential. The
evolution equation as well as the mechanical and electro-static balance laws are solved using the Finite Element
Method. The model is extended to allow for the simulation of point defects. Numerical examples are given for
the defect-free case, and the influence of point defects is investigated.
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