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Microstructures and Microwave Dielectric Properties of Low-Temperature Fired Ca0.8Sr0.2TiO3-Li0.5Sm0.5TiO3 Ceramics with Bi2O3-2B2O3 Addition

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Abstract

The microstructures and microwave dielectric properties of xCa0.8Sr0.2TiO3-(1−x) Li0.5Sm0.5TiO3 (x = 0.25, 0.28, 0.3, 0.35 and 0.4) ceramics with about 20 wt.% Bi2O3-2B2O3 (BB) addition were investigated. All the composite ceramics prepared using the conventional mixed oxide route consisted of a primarily orthorhombic perovskite xCa0.8Sr0.2TiO3-(1−x)Li0.5Sm0.5TiO3 solid-solution phase and minor secondary phases ascribed to LiBO2 and BiB3O6. It was found that the addition of 20 wt.% Bi2O3-2B2O3 in xCa0.8Sr0.2TiO3-(1−x) Li0.5Sm0.5TiO3 (CSLSTx) phases decreased the optimal sintering temperature range to 1025–1050°C. In the optimal sintering temperature range, the highest values of bulk density (ρ), dielectric constant (ε r) and the product (Q.f) of quality factor (Q) and frequency (f) for the ceramics were obtained. With x increasing from 0.25 to 0.40, ε r increased from 94.9 to 116.6 and τ f from −14.76 ppm/°C to 100.2 ppm/°C, while Q.f value slightly increased from 1725 GHz to 1745 GHz and then decreased from 1745 GHz to 1541 GHz. For the 100 CSLSTx-20BBO ceramics sintered at 1025°C, a near-zero τ f ceramic with ε r of 100 and Q.f value of 1737 GHz was obtained at x = 0.28.

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Acknowledgement

Financial support of the National Natural Science Foundation of China (Grants No. 11464006), the Natural Science Foundation of Guangxi (Grants No. 2014GXNSFBA118254), the research fund of Guangxi Key Laboratory of Information Materials through 1210908-209-Z, 1210908-05-Z, 1210908-207-Z and Guangxi Experiment Center of Information Science through 20130115 are gratefully acknowledged by the authors.

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Authors and Affiliations

  1. School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin, 541004, P.R. China

    Changlai Yuan, Guohua Chen, Tao Yang, Changrong Zhou & Yun Yang

  2. Guangxi Experiment Center of Information Science, Guilin University of Electronic Technology, Guilin, 541004, P.R. China

    Changlai Yuan & Guohua Chen

  3. College of Material Science and Engineering, Central South University, Changsha, 410083, P.R. China

    Fei Liu

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  1. Changlai Yuan
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  2. Guohua Chen
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  3. Tao Yang
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  4. Fei Liu
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  5. Changrong Zhou
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Correspondence to Changlai Yuan.

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Yuan, C., Chen, G., Yang, T. et al. Microstructures and Microwave Dielectric Properties of Low-Temperature Fired Ca0.8Sr0.2TiO3-Li0.5Sm0.5TiO3 Ceramics with Bi2O3-2B2O3 Addition. J. Electron. Mater. 44, 263–270 (2015). https://doi.org/10.1007/s11664-014-3422-9

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  • DOI: https://doi.org/10.1007/s11664-014-3422-9

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