Effects of polarons and oxygen vacancies on dielectric relaxation and electrical conductivity behavior in a lead-free relaxor ferroelectric

被引：7

作者：

Gonzalez-Abreu, Y. ^{[1
]}

Pelaiz-Barranco, A. ^{[1
]}

Suarez-Gonzalez, L. C. ^{[1
]}

Guerra, J. D. S. ^{[2
]}

机构：

[1] Univ La Habana, Fac Fis, Inst Ciencia & Tecnol Mat, Havana 10400, Cuba

[2] Univ Fed Uberlandia, Inst Fis, Grp Ferroeletr & Mat Multifuncionais, BR-38408100 Uberlandia, MG, Brazil

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2019年 / 787卷

关键词：

Relaxor; Ferroelectric; Dielectric response; Point defects; Ionic conduction; POLARIZATION; PEROVSKITE;

D O I：

10.1016/j.jallcom.2019.02.084

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Studies of the dielectric relaxation and the electrical conductivity processes for Sr0.15Ba0.85Bi2Nb2O9 relaxor ferroelectric ceramic are carried out to evaluate the influence of extrinsic and/or intrinsic defects on the a.c. response. The Cole-Cole model and the Universal Dielectric Response are used to determine the nature of these defects. The temperature dependence of both processes in the range 30 degrees C approximately 210 degrees C is associated to the response of polarons, in disordered surrounding, to the applied electric field. For higher temperatures, the main contribution to both dielectric relaxation and electrical conductivity processes is attributed to electrons that result from the ionization of oxygen vacancies. The study provides indirect evidence on the relaxor freezing temperature. (C) 2019 Elsevier B.V. All rights reserved.

引用

页码：140 / 144

页数：5

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