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Ferroelectrics Volume 401, 2010 - Issue 1
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SECTION A: THEORIES, MODELING, DOMAINS, PHASE TRANSITIONS AND CRITICAL PHENOMENA

New Lead-Free Relaxor Ferroelectrics Derived from (K0.5Na0.5)NbO3 for High Temperature Applications

Hongliang Du State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, China
,
Wancheng Zhou State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, China
,
Fa Luo State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, China
,
Dongmei Zhu State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, China
,
Shaobo Qu Electronic Materials Research Laboratory, Key Laboratory of Educational Ministry, Xi’an Jiaotong University, Xi’an, 710049, China
&
Zhibin Pei The College of Science, Air Force Engineering University, Xi’an, 710051, China
Pages 141-147 | Received 23 Aug 2009, Published online: 01 Dec 2010
 
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Abstract

In order to develop high-temperature lead-free relaxor ferroelectrics, 0.95(K0.5Na0.5) NbO3–0.05Ba(Mg1/3Nb2/3)O3 (0.95KNN–0.05BMN) solid solution was synthesized by conventional solid-state sintering. The diffuse phase transition and the temperature of the maximum dielectric permittivity shifting towards higher temperature with increasing frequency, which are two typical characteristics for relaxor ferroelectrics, were observed in 0.95KNN–0.05BMN solid solution. The dielectric relaxor behavior obeys a modified Curie-Weiss law. The relaxor nature is attributed to the appearance of polar nano-regions. The results indicate that this material is indeed a lead-free relaxor ferroelectric with high Tm (∼200°C), useful for high temperature applications.

Acknowledgments

This work was supported by NPU Foundation for Fundamental Research and Chinese National and Shaanxi Provincial Natural Science Foundation (No. 10804130 and No. 60871027).

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