Duplex structure in K0.5Na0.5NbO3-SrZrO3 ceramics with temperature-stable dielectric properties

被引：105

作者：

Liu, Zhiyong ^{[1
]}

Fan, Huiqing ^{[1
]}

Lei, Shenhui ^{[1
]}

Ren, Xiaohu ^{[1
]}

Long, Changbai ^{[1
]}

机构：

[1] Northwestern Polytech Univ, Sch Mat Sci & Engn, State Key Lab Solidificat Proc, Xian 710072, Peoples R China

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2017年 / 37卷 / 01期

关键词：

KNN-based; X8R specification; Core-shell structure; TEM; CORE-SHELL STRUCTURE; LEAD-FREE CERAMICS; PIEZOELECTRIC CERAMICS; SYSTEM; BATIO3; MICROSTRUCTURE; PIEZOCERAMICS; NIOBATE;

D O I：

10.1016/j.jeurceramsoc.2016.07.024

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：

Temperature-stable dielectric properties have been developed in the 0.86 K0.5Na0.5NbO3-0.14SrZrO(3) solid solution system. High dielectric permittivity (epsilon'=2310) with low loss sustained in a broad temperature range (-55-201 degrees C), which was close to that of the commercial BaTiO3-based high-temperature capacitors. Transmission electron microscopy with energy dispersive X-ray analysis directly revealed that submicron grains exhibited duplex core-shell structure. The outer shell region was similar to the target composition, whilst a slightly poor content of Sr and Zr presented in the core region. Based on Lichtenecker's effective dielectric function analysis along with Lorentz fit of the temperature dependence of dielectric permittivity, a plausible mechanism explaining the temperature-stable dielectric response in present work was suggested. These results offer an opportunity to achieve the X8 R specification high-temperature capacitors in K0.5Na0.5NbO3 based materials. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：115 / 122

页数：8

共 47 条

[1] Core-Shell Lead-Free Piezoelectric Ceramics: Current Status and Advanced Characterization of the Bi1/2Na1/2TiO3-SrTiO3 System [J].