Title: Structure analysis and microwave dielectric properties of CaxZn1−xSn0.08Ti1.92Nb2O10 ceramics
Abstract: Abstract The quantitative determination and the crystal structure of Ca x Zn 1− x Sn 0.08 Ti 1.92 Nb 2 O 10 ceramics were analyzed by X-ray diffraction, the microwave dielectric properties were investigated. The results showed that the Ca x Zn 1− x Sn 0.08 Ti 1.92 Nb 2 O 10 ceramics contained three main phases: ZnTiNb 2 O 8 phase, Zn 0.15 Nb 0.30 Ti 0.55 O 2 phase and Unknown Columbite-type phase. With the increase of Ca content, the weight fraction of secondary phase Zn 0.15 Nb 0.30 Ti 0.55 O 2 and Unknown Columbite-type phase increased. For ZnTiNb 2 O 8 , with the substitution of Ca 2+ for Zn 2+ , the bond valence of Ti-site increased. The variation of distortion of oxygen octahedral was irregular. For Zn 0.15 Nb 0.30 Ti 0.55 O 2 , the distortion of oxygen octahedral and the bond valence of Ti-site increased with substitution of Ca 2+ . The increase of Ti-site bond valence led to a harder rattling of Ti cations of the specimens. As a result, the dielectric constant ( e ) and the quality factor value ( Qf ) decreased, the temperature coefficient of resonant frequency ( τ f ) moved to the positive direction. The typical values of e = 53.09, Qf = 48,000 GHz, τ f = 21.20 ppm/°C were obtained for Ca x Zn 1− x Sn 0.08 Ti 1.92 Nb 2 O 10 ( x = 0.02) specimens sintered at 1120 °C for 6 h. The relative low sintering temperature and high dielectric properties in microwave range make these ceramics promising for application in multilayer ceramic capacitors.
Publication Year: 2014
Publication Date: 2014-01-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 17
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