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

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Abstract:

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1330℃烧结4h,获得最佳的微波介电性能εr=19.32,Q×f=193.527THz,τf=?2×10–6/℃。

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