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Microwave dielectric properties of temperature-stable (Mg0.95Co0.05)2TiO4–Li2TiO3 composite ceramics for LTCC applications

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Abstract

In this paper, the effects of Li2O–B2O3–Bi2O3–SiO2 (LBBS) glass on the phase formation, sintering characteristic, the microstructure and microwave dielectric properties of temperature-stable (Mg0.95Co0.05)2TiO4–Li2TiO3 ceramics were investigated. (Mg0.95Co0.05)2TiO4–Li2TiO3 powders were obtained by using the traditional solid-state process. A small amount of LBBS doping can effectively reduce sintering temperature and promote the densification of the ceramics. X-ray diffraction analysis revealed not only the primary phase (Mg·Co)2TiO4 associated with Li2TiO3 minor phase but also a third phase (Mg·Co)TiO3. The dielectric constant and Qf values vary with the doping amount of LBBS and sintering temperatures. With the compensation of the positive temperature coefficient (τ f ) of Li2TiO3 and the negative τ f of (Mg0.95Co0.05)2TiO4, the τ f of the specimens fluctuates around zero. The (Mg0.95Co0.05)2TiO4 ceramic with 2.5 wt% LBBS addition and sintering at 900 °C for 4 h exhibited excellent microwave dielectric properties: ɛ r  = 19.076, Qf = 126100 GHz, and τ f  = 0.98 ppm/°C.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China under Grant Nos. 61471096 and 51372031, Special Support Program of Guangdong Province under Grant No. 2014TX01C042 and Science and Technology Department of Sichuan Province 2016GZ0258, 2016JQ0016.

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Authors and Affiliations

  1. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, China

    Haiyu Wang, Hua Su, Yuanming Lai, Huaiwu Zhang, Yuanxun Li & Xiaoli Tang

  2. Institute of Electronic and Information Engineering, University of Electronic Science and Technology of China, Dongguan, 518105, China

    Hua Su & Yuanxun Li

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  1. Haiyu Wang
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  2. Hua Su
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  3. Yuanming Lai
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  6. Xiaoli Tang
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Correspondence to Hua Su.

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Wang, H., Su, H., Lai, Y. et al. Microwave dielectric properties of temperature-stable (Mg0.95Co0.05)2TiO4–Li2TiO3 composite ceramics for LTCC applications. J Mater Sci: Mater Electron 28, 14190–14194 (2017). https://doi.org/10.1007/s10854-017-7275-x

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  • DOI: https://doi.org/10.1007/s10854-017-7275-x

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