An earlier system of rotationally invariant electroelastic equations for deformable insulators, which was derived from a well-defined macroscopic model, is extended to include the simplest mechanical and electrical viscous-type dissipation. The resulting nonlinear description satisfies the principle of material objectivity. When the resulting description is linearized, the viscous-type linear electrical dissipative variable contains the spin tensor because a biasing polarization is present in the ferroelectric ceramic.
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