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CaTiO3基微波介质陶瓷的频率温度稳定性*
Resonant frequency temperature stability of CaTiO3 based microwave dielectric ceramics*
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摘要: 通过对克劳修斯-莫索蒂方程的近似,分析了钙钛矿结构微波介质陶瓷频率温度系数(τf)的主要影响因素,发现改变材料介电响应中离子位移极化和电子位移极化的比例,可调节频率温度系数的正负与大小.通过电子结构计算和容忍因子分析,预测引入(Zn1/3Nb2/3)4+对具有正温度系数的CaTiO3进行B位取代将提高材料电子极化响应比例,调节τf 由正变负.采用偏铌酸盐为前驱体,通过固相反应法合成了Ca[(Zn1/3Nb2/3)xTi(1?x)]O3钙钛矿结构陶瓷,并对其进行结构分析和性能测试,实验结果与理论分析一致,获得了具有近零频率温度系数的Ca[(Zn1/3Nb2/3)0.7Ti0.3]O3介质陶瓷材料.Abstract: The determinants of resonant frequency temperature coefficient (τf) have been analyzed by the approximate treatment of Clausius-Mossotti equation. It is suggested that the value ofτf can be adjusted by changing the contribution proportion of ionic polarization or electronic polarization for the dielectric constant. Results of electronic structure calculation and tolerance factor analysis show that B-site substitution of CaTiO3 with (Zn1/3Nb2/3)4+could turn the value ofτf from positive to negative, by enhancing the covalency in the BO6 octahedron and improving the contribution proportion of electronic polarization. Ca[(Zn1/3Nb2/3)xTi(1?x)]O3 dielectric ceramics were prepared by solid-state reaction method with niobate as precursor. Results of structure analysis and property measurement conform to the theoretical analysis. The Ca[(Zn1/3Nb2/3)0.7Ti0.3]O3 dielectric ceramic with near-zeroτf was obtained.
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