Effect of Alkali Elements Content on the Structure and Electrical Properties of (K0.48Na0.48Li0.04)(Nb0.90Ta0.04Sb0.06)O3 Lead-Free Piezoelectric Ceramics

被引：22

作者：

Lin, Dunmin ^{[1
]}

Kwok, Kin Wing

Chan, Helen Lai-wa

机构：

[1] Hong Kong Polytech Univ, Dept Appl Phys, Kowloon, Hong Kong, Peoples R China

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2009年 / 92卷 / 11期

关键词：

D O I：

10.1111/j.1551-2916.2009.03239.x

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

In this communication, we report on the effects of alkaline elements (K, Na, and Li) content on the electrical properties of (K0.48Na0.48Li0.04)(Nb0.90Sb0.06Ta0.04)O-3 ceramics. Because of the high volatility, the alkaline elements evaporate during the high-temperature sintering process, generating vacancy defects in the ceramics. As a result, the ferroelectric and piezoelectric properties of the ceramics become weakened. Our results reveal that the volatilization loss can be effectively compensated by a 1 mol% excess of alkaline elements. The remanent polarization P-r, piezoelectric coefficient d(33), and electromechanical coupling coefficient k(p) of the compensated ceramics are improved by 15%, 16%, and 20%, respectively, having a value of 30 mu C/cm2, 310 pC/N, and 0.6.

引用

页码：2765 / 2767

页数：3

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