Effects of K Excess on the Preparation and Characterization of (K0.5Na0.5)NbO3 Ceramics

被引：7

作者：

Zhang, Dongsheng ^{[1
]}

Zhang, Zheng ^{[1
]}

机构：

[1] Xi An Jiao Tong Univ, Sch Mech Engn, Xian 710049, Peoples R China

来源：

FERROELECTRICS | 2014年 / 466卷 / 01期

基金：

美国国家科学基金会;

关键词：

Potassium sodium niobate; electrical properties; K excess; perovskitestructure; SINGLE-CRYSTALS; PIEZOELECTRIC PROPERTIES; ELECTRICAL-PROPERTIES; BEHAVIOR; PHASE;

D O I：

10.1080/00150193.2014.894449

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Lead-free ceramics (K0.5+x Na-0.5)NbO3 (0 <= x <= 0.3, KNN-x) were prepared following a novel method by mixing perovskite structure of NaNbO3 and KNbO3 powders. Effects of K excess and sintering temperatures on phase structure, microstructure and electrical properties of KNN ceramics were investigated. Result showed that the single phase perovskite structure was obtained in ceramics which sintered at 1075 degrees C except the KNN-x ceramic with x = 0.3. The KNN-x ceramic with x = 0.2 showed optimized ferroelectric property with P-r = 25.5 mu C/cm(2) at E-c = 4.57kV/cm and piezoelectric property with d(33) = 117 pC/N because of the single perovskite structure and homogeneous dense microstructure. The results show that K excess ceramics are a promising candidate for lead-free materials.

引用

页码：8 / 13

页数：6

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