Abstract

Temperature dependences of dielectric permittivity ϵ33, piezoelectric constant d36 and elastic compliance S66 of K1-x(NH4)xH2PO4 ferro – antiferroelectric (FE - AFE) mixed crystals have been studied within temperature range 30 – 300 К. It was found a considerable contribution of the strain component x6 to polarization P3 near the FE transition temperature due to piezoelectric effect. Piezoelectric contribution to dielectric response in the vicinity AFE phase transition is weaker. It leads, in particular, to difference in the both shapes and positions of ϵ33 and S66 anomalies for K0,25(NH4)0,75H2PO4 single crystal near the transition temperature.

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