Electric field-induced phase transition from the glasslike to paraelectric phase and dielectric spectra hardening in PMN single crystal

作     者：E.Koroleva A.Molokov S.Vakhrushev 

作者机构：Ioffe InstitutePolytekhnicheskaya 26194021St.-PetersburgRussia 

出 版 物：《Journal of Advanced Dielectrics》 (先进电介质学报（英文）)

年 卷 期：2023年第13卷第2期

页      面：1-5页

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：The study was supported by Russian Science Foundation grant no.22-12-00328 https://rscf.ru/en/project/22-12-00328/ 

主　　题：Relaxor ferroelectrics dielectric spectroscopy phase transition lead magnoniobate 

摘      要：One of the key points in the physics of the relaxors is their response to the applied DC *** studies of this topic were made,in particular on the influence of the field on the dielectric ***,practically,in all the cases,the measurements were performed at a fixed frequency and usually with the change in the temperature at the fixed field *** this paper,we report the evolution of the dielectric spectra at low frequencies(0.1 Hzω1 kHz)at fixed temperature 246 K on changing the DC electric field applied in(111)from 1 kV to 7 ***-Cole function was used to describe the spectra and the field dependences of the mean relaxation timeτ,the oscillation strengthΔεand the width parameterαwere *** obtainedτ(E)andΔε(E)provide evidence of the field-induced transition from the nonpolar glass-like phase to the nonpolar paraelectric phase at around 1.5 kV/*** the paraelectric phase,very fast hardening of the spectra was observed withτchanging from 10 s to about 10−4 *** performed analysis demonstrated that the earlier reported positive C-V effect is completely determined by the spectra harden­ing,whileΔεdoes not show any change in the glass-like phase and monotonously decreases with a field increase in the paraelectric *** complete understanding of the microscopic origin of the observed phenomena,a detailed study on the short-and long-range structures at the same condition is necessary.