Ferroelectricity

Nonlinear dielectric response in the mixed K$_{0.91}$(NH$_4$)$_{0.09}$H$_2$PO$_4$ crystal

L. N. Korotkov^a, T. N. Korotkova<sup>b

a</sup> Voronezh State Technical University
^b Voronezh Institute of Russian Ministry of Internal Affairs

Abstract: The influence of bias and variable electric fields on the dielectric response of the K$_{0.91}$(NH$_4$)$_{0.09}$H$_2$PO$_4$ single crystal has been studied in the vicinity of the ferroelectric phase transition temperature $T_C$. Below $T_C$, the nonlinear response is caused mainly by the domain mechanism. This is confirmed, in particular, by observations of chaotic oscillations in a series $RLC$-circuit containing the studied sample as a capacitor $C$ and excited by a sinusoidal voltage. Peculiarities of the behavior of the dielectric nonlinearity are found near the Curie temperature, which are explained by the emergence of an intermediate heterophase state.

Received: 20.07.2012

 English version: Physics of the Solid State, 2013, 55:2, 342–345

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