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Microstructure and Microwave Dielectric Properties of (1−x)MgAl2O4–x(Ca0.8Sr0.2)TiO3 Ceramics

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Abstract

The microwave dielectric properties of the (1−x)MgAl2O4–x(Ca0.8Sr0.2)TiO3 (x = 0.02 to 0.10) ceramic system synthesized by the traditional solid-state reaction method have been investigated. Spinel-structured MgAl2O4 was present together with perovskite-structured (Ca0.8Sr0.2)TiO3, and this multiphase system was verified by x-ray diffraction (XRD) and energy spectrum analyses throughout the whole compositional range. With increasing x, the temperature coefficient of resonant frequency (τ f) and permittivity (ε r) gradually increased. Consequently, near-zero τ f could be obtained for samples with x = 0.08. Excellent microwave dielectric properties with relative permittivity (ε r) of 10.92, quality factor (Q × f) of 52,563 GHz (at 12.9 GHz), and temperature coefficient of resonant frequency (τ f) of −5.6 ppm/°C were obtained for 0.92MgAl2O4−0.08(Ca0.8Sr0.2)TiO3 composite sintered at 1440°C for 3 h, making this material a promising candidate for use in global communication satellites and radar detectors.

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Acknowledgements

This work was supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions and Program for Changjiang Scholars␣and Innovative Research Team in University (PCSIRT), IRT1146.

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Authors and Affiliations

  1. College of Materials Science and Engineering, Nanjing Tech University, Nanjing, 210009, China

    Yafei Huang, Jun Yu, Chunying Shen & Mingliang Tang

  2. Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing, 210009, China

    Chunying Shen

  3. Donghai Advanced Silicon-Based Materials Institute, Nanjing Tech University, Donghai, 222300, China

    Mingliang Tang

Authors
  1. Yafei Huang
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  2. Jun Yu
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  3. Chunying Shen
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  4. Mingliang Tang
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Correspondence to Chunying Shen.

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Huang, Y., Yu, J., Shen, C. et al. Microstructure and Microwave Dielectric Properties of (1−x)MgAl2O4–x(Ca0.8Sr0.2)TiO3 Ceramics. J. Electron. Mater. 45, 4903–4907 (2016). https://doi.org/10.1007/s11664-016-4533-2

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  • DOI: https://doi.org/10.1007/s11664-016-4533-2

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