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Aluminum substitution for titanium in Ba3.75Nd9.5Ti18O54 microwave dielectric ceramics

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Abstract

Effects of aluminum substitution for titanium on microwave dielectric properties of Ba3.75Nd9.5Ti18−zAlzO54 (z = 0–3.0) ceramics were investigated in this study. X-ray diffraction patterns of sintered samples revealed single-phase formation with an orthorhombic structure of all compositions. Scanning electron microscopy (SEM) and energy dispersive spectrometer results confirmed the substitution at b-site. A small amount of aluminum substitution into b-site lead to the decrease of relative dielectric constant (εr) and temperature coefficient of resonant frequency (τf), but significantly improved the quality factor (Qf). Further aluminum substitution content of z ≥ 1.5 resulted in the drop of Qf value and restraint of Ti reduction. Excellent microwave dielectric properties with z = 1.5 sintered at 1,350 °C for 2 h in air would be obtained: εr = 72.7, Qf = 13,112 GHz and τf = +5 ppm/°C. Tolerance factor, electronegativity difference, ionic polarizability and b-site bond valence were calculated to clarify the relationship between microstructure and microwave dielectric properties.

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Acknowledgments

This work is supported by National Natural Science Funds of China (Grant No. 51402039).

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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, Jianshe Road, Chengdu, 610054, China

    Hetuo Chen, Bin Tang, Shuxin Duan, Han Yang, Yingxiang Li, Hao Li & Shuren Zhang

  2. Department of Physics and Siyuan Laboratory, Jinan University, Guangzhou, 510632, China

    Anqi Gao

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  1. Hetuo Chen
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  2. Bin Tang
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Correspondence to Hetuo Chen or Bin Tang.

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Chen, H., Tang, B., Gao, A. et al. Aluminum substitution for titanium in Ba3.75Nd9.5Ti18O54 microwave dielectric ceramics. J Mater Sci: Mater Electron 26, 405–410 (2015). https://doi.org/10.1007/s10854-014-2414-0

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  • DOI: https://doi.org/10.1007/s10854-014-2414-0

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