Crystal structure and microwave dielectric characteristics of Zr-substituted CoTiNb2O8 ceramics
Crystal structure and microwave dielectric characteristics of Zr-substituted CoTiNb2O8 ceramics
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Zr取代CoTiNb2O8陶瓷的晶体结构及微波介电特性
DOI：
10.1016/j.jeurceramsoc.2016.02.026
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发表时间：
2016-07
影响因子：
5.7
通讯作者：
Xiang Maoqiao
中科院分区：
文献类型：
--
作者：
Zhang Yun;Zhang Yingchun;Xiang Maoqiao
采用常规固相反应法制备了Co(Ti1-xZrx) nb2o8微波介质陶瓷。讨论了晶体结构对微波介电性能的影响。用x射线粉末衍射、拉曼光谱和透射电镜分析了相变。组成诱导的一系列相变顺序为：四方金红石结构→金红石与黑钨矿相共存→单斜黑钨矿结构。对于Co(Ti1-xZrx) nb2o8化合物，从0到1的Zr取代导致ε从62.4下降到23.8。与εr相反，Q×fincreased有很大的差异，这可以用填料分数来解释。τf与氧八面体畸变和b位键价有关。coti0.4 zr0.6 nb2o8陶瓷的ε ε系数为29.9，频率为highQ×fof 72,833 GHz， τf接近于4.4 ppm/°C。
Co(Ti1-xZrx)Nb2O8microwave dielectric ceramics were synthesized via the conventional solid-state reaction route. The dependence of microwave dielectric properties on the crystal structure was discussed. The phase transitions were analyzed using X-ray powder diffraction, Raman spectroscopy, and transmission electron microscopy. A series of composition-induced phase transitions were confirmed via the sequence: tetragonal rutile structure → coexistence of rutile and wolframite phase → monoclinic wolframite structure. For the Co(Ti1-xZrx)Nb2O8compounds, Zr substitutions from 0 to 1 led to a decrease in theεrfrom 62.4 to 23.8. In contrast toεr,Q×fincreased considerably, which was explained in terms of packing fraction. Theτfwas correlated with oxygen octahedral distortion and B-site bond valence. A near zeroτfof 4.4 ppm/°C was obtained in the CoTi0.4Zr0.6Nb2O8ceramics with anεrof 29.9 and a highQ×fof 72,833 GHz.
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影响因子：
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