Anomalous change in leakage and displacement currents after electrical poling on lead-free ferroelectric ceramics

被引：42

作者：

Borkar, Hitesh ^{[1
,2
]}

Tomar, M. ^{[3
]}

Gupta, Vinay ^{[4
]}

Scott, J. F. ^{[5
,6
]}

Kumar, Ashok ^{[1
,2
]}

机构：

[1] CSIR, Natl Phys Lab, New Delhi 110012, India

[2] CSIR, Acad Sci & Innovat Res AcSIR, Natl Phys Lab, New Delhi 110012, India

[3] Univ Delhi, Dept Phys, Delhi 110007, India

[4] Univ Delhi, Dept Phys & Astrophys, Delhi 110007, India

[5] Univ St Andrews, Dept Chem, St Andrews KY16 ST, Fife, Scotland

[6] Univ St Andrews, Dept Phys, St Andrews KY16 ST, Fife, Scotland

来源：

APPLIED PHYSICS LETTERS | 2015年 / 107卷 / 12期

关键词：

PIEZOELECTRIC CERAMICS; CAPACITORS; TITANATE; FATIGUE;

D O I：

10.1063/1.4931696

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report the polarization, displacement current, and leakage current behavior of a trivalent nonpolar cation (Al3+) substituted lead free ferroelectric (Na0.46Bi0.46-xAlxBa0.08)TiO3 (NBAT-BT) (x = 0, 0.05, 0.07 and 0.10) electroceramics with tetragonal phase and P4 mm space group symmetry. Almost, three orders of magnitude decrease in leakage current were observed under electrical poling, which significantly improves microstructure, polarization, and displacement current. Effective poling neutralizes the domain pinning, traps charges at grain boundaries and fills oxygen vacancies with free charge carriers in matrix, thus saturated macroscopic polarization in contrast to that in unpoled samples. E-poling changes "bananas" type polarization loops to real ferroelectric loops. (C) 2015 AIP Publishing LLC.

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页数：5

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