| Summary: | Mechanical, electrical and thermal phenomena occurring in piezoelectric crystals were examined by non-linear approximation. For this purpose, use was made of the thermodynamic function of state, which describes an anisotropic body. Considered was the Gibbs function. The calculations included strain tensor ε<sub>ij</sub>=f(σ<sub>kl</sub>,E<sub>n</sub>,T), induction vector D<sub>m</sub>=f(σ<sub>kl</sub>,E<sub>n</sub>,T) and entropy S=f(σ<sub>kl</sub>,E<sub>n</sub>,T) as function of stress σ<sub>kl</sub>, field strength E<sub>n</sub> and temperature difference T. The equations obtained apply to anisotropic piezoelectric bodies provided that the "forces" σ<sub>kl</sub>, E<sub>n</sub>, T acting on the crystal are known.
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