Relaxorlike dielectric properties and history-dependent effects in the lead-free K0.5Na0.5NbO3-SrTiO3 ceramic system

被引：76

作者：

Bobnar, V ^{[1
]}

Bernard, J ^{[1
]}

Kosec, M ^{[1
]}

机构：

[1] Jozef Stefan Inst, SI-1001 Ljubljana, Slovenia

来源：

APPLIED PHYSICS LETTERS | 2004年 / 85卷 / 06期

关键词：

D O I：

10.1063/1.1779947

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Typical relaxorlike dielectric properties, such as broad dispersive dielectric maximum, Vogel-Fulcher temperature dependence of the characteristic relaxation frequency, and paraelectric-to-glass crossover in the temperature dependence of the dielectric nonlinearity, have been detected in the derived lead-free K0.5Na0.5NbO3-SrTiO3 ceramic system. Relatively large values of the dielectric constant, being almost independent of the frequency in the range of 100 Hz-1 MHz, suggest possible applications based on this environmentally friendly system. Furthermore, the history-dependent effects, such as aging of the dielectric constant and fatigue of the polarization switching, are much weaker than in some widely used lead-based relaxors. (C) 2004 American Institute of Physics.

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页码：994 / 996

页数：3

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