On the question of the critical end point in the (1 − x)PbMg_1/3Nb_2/3O₃-xPbTiO₃ relaxor ferroelectric single crystals based on acoustic emission data studies

¹ Department of Applied Physics, The Hebrew University of Jerusalem - Jerusalem 91904, Israel
² A. Chełkowski Institute of Physics, University of Silesia in Katowice - 41-500 Chorzow, Poland

Received: 7 January 2021
Accepted: 25 February 2021

Abstract

()PbMgNbOPbTiO₃, [100]-oriented relaxor ferroelectric crystals were studied by means of dielectric and acoustic emission methods in a temperature range up to 200 °C and under a dc bias electric field up to 1.2 kV/cm. The monoclinic-tetragonal and tetragonal-cubic ferroelectric phase transitions were successfully detected by both experimental methods. The bias electric field dependence of the temperature of a dielectric constant maximum, related to tetragonal-cubic phase transitions, exhibits a V-shape effect with a threshold field of 0.5 kV/cm. In contrast, the bias electric field dependence of the temperature of a monoclinic-tetragonal phase transition exhibits no V-shape effect but points out a tricritical point at 0.7 kV/cm. These results have not confirmed the existence of the critical end point in the crystals under studies.