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Tungsten bronze type structure, atmosphere sensitivity and microwave dielectric properties of Ba4(CexSm1−x)9.3Ti18O54 ceramics

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Abstract

The phase structure, ions valence state and microwave dielectric properties of Ba4(Ce x Sm1−x )9.3Ti18O54 (0 ≤ x ≤ 0.9, BCST) ceramics sintered in air and nitrogen have been investigated. BCST (x ≤ 0.1) ceramics sintered in air only exhibited peaks associated with tungsten bronze phase structure. A secondary CeO2 phase appeared for x = 0.5, while CeO2 and Ba2Ti9O20 phases coexisted for the ceramics with x = 0.9. In contrast, ceramics fired in nitrogen exhibited tungsten bronze phase structure for all compositions from x = 0 to 0.9 within the solid solution. The chemical structure analysis exhibited that, all the sample possessed mixed ion valance states of Ce4+/Ce3+ and Ti4+/Ti3+ cations upon oxygen vacancy formations. It is found that incorporation of cerium could significant improve the Q × f values of BCST ceramics sintered in nitrogen with good microwave dielectric properties (Q × f ∼7536 GHz, ε r ∼78, and τ f ∼24.61 ppm/°C) at x = 0.5.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (Grant No. 51302093). The authors are grateful to the Analytical and Testing Center, Huazhong University of Science and Technology, for the XPS analyses.

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Authors and Affiliations

  1. School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, People’s Republic of China

    Jing Tao, Maolin Mu, Xiaohong Wang, Burhan Ullah, Fangyuan Chen & Wenzhong Lu

  2. Key Lab of Functional Materials for Electronic Information (B), Ministry of Education, Wuhan, 430074, People’s Republic of China

    Jing Tao, Maolin Mu, Xiaohong Wang, Burhan Ullah, Fangyuan Chen & Wenzhong Lu

  3. Fenghua Advanced Technology Holding Co. LTD, Guangzhou, People’s Republic of China

    Kerong An & Hongjuan Su

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  1. Jing Tao
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  2. Maolin Mu
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Correspondence to Xiaohong Wang.

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Tao, J., Mu, M., Wang, X. et al. Tungsten bronze type structure, atmosphere sensitivity and microwave dielectric properties of Ba4(CexSm1−x)9.3Ti18O54 ceramics. J Mater Sci: Mater Electron 28, 16888–16894 (2017). https://doi.org/10.1007/s10854-017-7607-x

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  • DOI: https://doi.org/10.1007/s10854-017-7607-x

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