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Microstructure and microwave dielectric characteristics of the CaxZn1−xTiNb2O8 temperature stable ceramics

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Abstract

The quantitative determination and the crystal structure of CaxZn1−xTiNb2O8 ceramics were analyzed by X-ray diffraction, the microwave dielectric properties were investigated. The results showed that the CaxZn1−xTiNb2O8 ceramics contained three main phases: ZnTiNb2O8 phase Zn0.17Nb0.33Ti0.5O2 phase and CaNb2O6 phase. With the increase of Ca content, the weight fraction of secondary phase Zn0.17Nb0.33Ti0.5O2 and CaNb2O6 increased. For ZnTiNb2O8, with the substitution of Ca2+ for Zn2+, the bond valence of Ti-site increased. The variation of distortion of oxygen octahedral was irregular. For Zn0.17Nb0.33Ti0.5O2, the distortion of oxygen octahedral and the bond valence of Ti-site increased with substitution of Ca2+. The increase of Ti-site bond valence led to a harder rattling of Ti cations of the specimens. As a result, the dielectric constant (ε) and the quality factor value (Qf) decreased, the temperature coefficient of resonant frequency (τ f ) moved to the positive direction. The typical values of ε = 38.6, Qf = 41,338 GHz, τ f  = −1.28 × 10−6/°C were obtained for CaxZn1−xTiNb2O8 (x = 0.45) specimens sintered at 1100 °C for 6 h. The high dielectric properties in microwave range drive these materials a promising application in electronics.

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Authors and Affiliations

  1. Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education, School of Electronic and Information Engineering, Tianjin University, Tianjin, 300072, China

    Lingxia Li, Hao Sun, Xiaosong Lv & Sai Li

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  1. Lingxia Li
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  2. Hao Sun
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  3. Xiaosong Lv
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Correspondence to Lingxia Li.

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Li, L., Sun, H., Lv, X. et al. Microstructure and microwave dielectric characteristics of the CaxZn1−xTiNb2O8 temperature stable ceramics. J Mater Sci: Mater Electron 27, 126–133 (2016). https://doi.org/10.1007/s10854-015-3727-3

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