Mixture behavior and microwave dielectric properties of (1 - x)Ca2P2O7-xTiO2
Mixture behavior and microwave dielectric properties of (1 - x)Ca2P2O7-xTiO2
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DOI：
10.1016/j.jeurceramsoc.2005.09.050
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发表时间：
2006
影响因子：
5.7
通讯作者：
I. Cho;Sang Ku Kang;Dong‐Wan Kim;K. Hong
中科院分区：
文献类型：
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作者：
I. Cho;Sang Ku Kang;Dong‐Wan Kim;K. Hong
采用固相反应制备了(1−x)β- ca2p2o7 - xtio2。用x射线粉末衍射仪和网络分析仪分别研究了混合行为和微波介电性能。x射线粉末衍射图显示β- ca2p2o7和tio2以混合形式存在，SEM分析也证实了这一点。结果表明，共振频率τf为正的TiO2通过混合物的形成补偿了β-Ca2P2O7的负τf（−53ppm/°C）。电介质性能随tio2含量的变化可以用混合规律来解释。在0.3<x<0.4区域，τf值可以成功地降至几乎为零。特别是在x=0.3时，获得了良好的微波介电性能：Q×f=44,000, r=10.9, τf= - 11ppm/°C。
(1−x)β-Ca2P2O7–xTiO2were prepared by solid-state reaction. The mixture behavior and microwave dielectric properties were investigated using X-ray powder diffraction and a network analyzer, respectively. X-ray powder diffraction patterns showed that β-Ca2P2O7and TiO2existed in a mixture form, which was also confirmed by SEM analysis. It was shown that TiO2, which has positive temperature coefficient of the resonant frequency (τf), compensated the negative τfof β-Ca2P2O7(−53ppm/°C) through mixture formation. The variation of dielectric properties with a function of TiO2contents could be explained using mixture rule. In the 0.3<x<0.4 regions, τfvalue could be successfully reduced almost zero. In particular, at x=0.3, good microwave dielectric properties was obtained: Q×f=44,000, ɛr=10.9, and τf=−11ppm/°C.