Study of the dielectric behaviour of KH₂AsO₄ and KD₂AsO₄ in the ferroelectric phase

M. Fally Institute of Experimental Physics, University of Vienna, A-1090, Wien, Austria

A. Fuith Institute of Experimental Physics, University of Vienna, A-1090, Wien, Austria

W. Schranz Institute of Experimental Physics, University of Vienna, A-1090, Wien, Austria

H. Warhanek Institute of Experimental Physics, University of Vienna, A-1090, Wien, Austria

P. Kubinec Technical University of Transport and Communication, Department of Physics, 01026, Žilina, Slovakia

C. Filipič University of Ljubljana, Jožef Stefan Institute, 61111, Ljubljana, Slovenia

Abstract

The temperature and frequency dependent dielectric susceptibilities of KH₂AsO₄ and KD₂AsO₄ were studied in the ferroelectric phase. A relaxational dispersion in the high frequency range (10⁸ Hz and 10⁷ Hz resp.) was found which is related to the dipol reversal. The dispersion is described by a Gaussian distribution of relaxation times’ which show Vogel-Fulcher temperature dependences. The high value of the dielectric constant below the phase transition is related to the mobility of the domain walls. This mobility steeply decreases near the freezing temperature T_f and therefore a sudden decrease in the susceptibility takes place. A nonlinear superposition of the piezoelectric resonance and the relaxational dispersion was observed.

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Study of the dielectric behaviour of KH₂AsO₄ and KD₂AsO₄ in the ferroelectric phase

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Study of the dielectric behaviour of KH₂AsO₄ and KD₂AsO₄ in the ferroelectric phase