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Structural and dielectric tunable properties of Ba0.4Sr0.6Ti1−y Si y O3 microwave ceramics

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Abstract

The structure-property relationships in Ba0.4Sr0.6Ti1−y Si y O3 with y=0.00, 0.01, 0.02, 0.05, 0.10 and 0.20 ceramics have been studied by using X-ray diffraction, electron microscopy and dielectric spectroscopy. An increase of Si concentration is not favorable for the stability of the perovskite structure, which results in the formation of BaTiSiO5 secondary phase. The dielectric peaks of samples are suppressed, broadened and shifted to low temperature with increasing Si concentration. Permittivity and Q value are reduced gradually with increasing Si concentration, due to growing of second BaTiSiO5 phase. The tunability (T) still remains ∼18.0% under 60 kV/cm biasing for the samples with y⩽0.10. The best combination of microwave dielectric properties are obtained for the composition of y=0.10: ɛ=531, Q=391 (at 1.610 GHz) and T=17.7%.

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Authors and Affiliations

  1. College of Materials Science and Engineering, China Jiliang University, Hangzhou, 310018, China

    JingJi Zhang & JiangYing Wang

  2. Functional Materials Research Laboratory, Tongji University, Shanghai, 200092, China

    JingJi Zhang & JiWei Zhai

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  1. JingJi Zhang
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  2. JiWei Zhai
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Zhang, J., Zhai, J. & Wang, J. Structural and dielectric tunable properties of Ba0.4Sr0.6Ti1−y Si y O3 microwave ceramics. Sci. China Technol. Sci. 55, 610–615 (2012). https://doi.org/10.1007/s11431-011-4570-2

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  • DOI: https://doi.org/10.1007/s11431-011-4570-2

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