Microwave dielectric properties of (1-x)ZnMoO4-xTiO2 composite ceramics
Microwave dielectric properties of (1-x)ZnMoO4-xTiO2 composite ceramics
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DOI：
10.1016/j.jallcom.2011.02.155
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发表时间：
2011-05-12
影响因子：
6.2
通讯作者：
Yao, Xi
中科院分区：
文献类型：
--
作者：
Guo, Jing;Zhou, Di;Yao, Xi
采用传统的固相反应法制备了(1-x)ZnMoO4-xTiO2(x=0.0、0.0 5、0.158、0.2 5、0.35)复合陶瓷。研究了该材料的烧结行为、物相组成、与银的化学相容性和微波介电性能。X-射线衍射仪分析表明，在950℃以下，所有样品都能很好地致密化。X射线衍射分析表明，三斜相黑钨矿相与四方金红石型二氧化钛相共存，银易与锌钼酸锌反应生成Ag2Zn2(MoO4)(3)相，难与二氧化钛反应。当二氧化钛体积分数(x值)从0增加到0.35时，(1-x)ZnMoO4-xTiO2复相陶瓷的微波介电常数从8.0%增加到25.2%，Q(F)值在32,300~43,300 GHz范围内变化，温度系数tau(F)值在-128.9~157.4 ppm/℃之间变化。当x=0.158时，混合物具有良好的微波介电性能，epsilon(R)=13.9，aQ(F)=40,400 GHz，和爱思唯尔出版的2011年a tau(F)=+2.0ppm/℃。
(1 - x)ZnMoO4-xTiO(2) (x = 0.0, 0.05, 0.158, 0.25, and 0.35) composite ceramics were synthesized by the conventional solid state reaction process. The sintering behavior, phase composition, chemical compatibility with silver, and microwave dielectric properties were investigated. All the specimens can be well densified below 950 degrees C. From the X-ray diffraction analysis, it indicates that the triclinic wolframite ZnMoO4 phase coexists with the tetragonal rutile TiO2 phase, and it is easy for silver to react with ZnMoO4 to form Ag2Zn2(MoO4)(3) phase and hard to react with TiO2. When the volume fraction of TiO2 (x value) increasing from 0 to 0.35, the microwave dielectric permittivity of the (1 - x)ZnMoO4-xTiO(2) composite ceramics increases from 8.0 to 25.2, the Q(f) value changes in the range of 32,300-43,300 GHz, and the temperature coefficient tau(f) value varies from - 128.9 to 157.4 ppm/degrees C. At x = 0.158, the mixture exhibits good microwave dielectric properties with a epsilon(r) = 13.9, a Q(f) = 40,400 GHz, and a tau(f) = + 2.0 ppm/degrees C. (C) 2011 Published by Elsevier B.V.