硅酸盐学报

MgSn0.05Ti0.95O3–SrTiO3复相陶瓷的显微结构与微波介电性能

单位：1. 南京工业大学材料科学与工程学院南京 210009 2. 广东风华高新科技股份有限公司广东肇庆 526000

分类号：TQ174.75

出版年,卷(期):页码：2013,41(1):50-54

DOI：

摘要：

摘要：采用传统固相法制备了不同摩尔配比的(1–x)MgSn0.05Ti0.95O3–xSrTiO3微波介质复相陶瓷材料，研究了复相陶瓷的烧结特性、显微结构和微波介电性能。结果表明：MgSn0.05Ti0.95O3和SrTiO3两相共存，无固溶现象。随着SrTiO3含量的增多，(1–x)MgSn0.05Ti0.95O3–xSrTiO3的相对介电常数(εr)线性增大，品质因数(Q × f)下降，谐振频率温度系数(τf)从负值变为正值。通过调节x值，可以获得近零的τf值。陶瓷的τf变化符合Lichtenecker混合法则。0.98MgSn0.05Ti0.95O3–0.02SrTiO3复相陶瓷在1 330 ℃烧结4 h，获得最佳的微波介电性能：εr = 19.32，Q × f = 193.527 THz，τf = −2 × 10–6/℃。

Abstract: The microwave dielectric multiphase ceramics of (1–x)MgSn0.05Ti0.95O3–xSrTiO3 were prepared by a conventional solid-state route. The sinterability, microstructure and microwave dielectric properties of the multiphase ceramics were investigated. The results show that MgSn0.05Ti0.95O3 and SrTiO3 can co-exist as two phases without any solid solution. The relative dielectric constant (εr) linearly increased, the quality factor (Q × f ) decreased and the value of the temperature coefficient of resonance frequency (τf) varied from negative to positive with the increase of SrTiO3 content. In addition, a near-zero τf value was obtained by the adjustment of the value of x. The variation in the the value of τf of (1–x)MgSn0.05Ti0.95O3–xSrTiO3 multiphase ceramics followed the Lichtenecker mixture rules. The multiphase ceramic 0.98MgSn0.05Ti0.95O3–0.02SrTiO3 sintered at 1 330 ℃ for 4 h had excellent microwave dielectric properties (i.e., εr = 19.32, Q × f = 193.527 THz, τf = −2 × 10–6/℃).

基金项目：

江苏高校优势学科建设工程资助项目(PAPD)；江苏省高校自然科学基金(10KJB430008)；广东省科技计划项目；广东省战略性新兴产业核心技术攻关(2011A091103002)。

作者简介：

第一作者：龚志杰(1988—)，男，硕士研究生。通信作者：张其土(1962—)，男，博士，教授。

参考文献：

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DOI：10.7521/j.issn.0454–5648.2013.01.11

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