Microstructure and microwave dielectric properties of Ca[Ti1−x(Mg1/3Nb2/3)x]O3 ceramics
作者： Fei Zhao , Zhenxing Yue , Yingchun Zhang , Zhilun Gui , Longtu Li
DOI: 10.1016/J.JEURCERAMSOC.2004.07.036
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摘要: Abstract Microwave dielectric ceramics of Ca[Ti 1− x (Mg 1/3 Nb 2/3 ) ]O 3 ( = 0.40–0.70) were prepared by solid-state reaction method. The microwave properties, such as constants, Q × f values and τ (temperature coefficient resonant frequency) studied a function composition sintering temperature. In all the range, sintered have orthorhombic perovskite structure in which lattice parameters increase with increasing . substitution Mg for Ti promotes grain growth. With from 0.40 to 0.70, constant decreases 62.97 41.56, value increases 12,213 29,428 GHz, 92.6 −12.6 ppm/°C. A near-zero was achieved at = 0.65 44.24 28,340 GHz. change is related variation tolerance factor, influences tilting oxygen octahedra structure.
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