Exploring the electromechanical response and electric field-induced dielectric anomalies in PMN-PT electroceramics  

作　　者：J.D.S.Guerra C.A.Guarany E.C.Lima E.B.Araújo J.E.Garcia 

机构地区：[1]Grupo de Ferroelétricos e Materiais Multifuncionais Instituto de Física,Universidade Federal de Uberlandia Uberlandia,Minas Gerais 38408-100,Brazil [2]Universidade Federal do Tocantins,Porto Nacional Tocantins 77500-000,Brazil [3]Departamento de Física e Química,Universidade Estadual Paulista Ilha Solteira–Sao Paulo 15385-000,Brazil [4]Department of Physics,Universitat Politècnica de Catalunya–BarcelonaTech Barcelona 08034,Spain

出　　处：《Journal of Advanced Dielectrics》2021年第3期32-38,共7页先进电介质学报（英文）

基　　金：The authors would like to thank the National Council of Scientific and Technological Development(CNPq)grant 303447/2019-2,Minas Gerais Research Foundation(FAPEMIG)grants PPM-00661-16 and APQ-02875-18 and Coordenacao de Aperfeicoamento de Pessoal de Nível Superior—Brasil(CAPES)—Finance Code 001 Brazilian agencies for the financial support;The financial support of the PGC2018-099158-B-I00 project(Spanish Government)is also gratefully acknowledged.

摘　　要：Electromechanical and dielectric properties of PMN-PT ferroelectric ceramics are investigated.In particular,dielectric response studies focus on the investigation of the influence of the DC applied electric field on the dielectric permittivity as a function of temperature and frequency.Results reveal an electric field driven dielectric anomaly in the dielectric permittivity curves,e(E),which in turn prevails in the whole ferroelectric phase region and continuously vanishes for temperatures near the paraelectric-ferroelectric phase transition temperature.A schematic model for the domains dynamics of the studied material is proposed taking into account the simultaneous contribution of both 90°and 180°domains walls.

关 键 词：FERROELECTRICS PMN-PT DOMAIN-WALLS dielectric response electric field 

分 类 号：TQ1[化学工程]