Microstructure and Microwave Dielectric Properties of (1−x)MgAl2O4–x(Ca0.8Sr0.2)TiO3 Ceramics
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- 作者：Yafei Huang ; Jun Yu ; Chunying Shen ; Mingliang Tang
- 关键词：(1−x)MgAl2O4–x(Ca0.8Sr0.2)TiO3 ceramics ; dielectric properties ; quality factor ; sintering
- 刊名：Journal of Electronic Materials
- 出版年：2016
- 出版时间：October 2016
- 年：2016
- 卷：45
- 期：10
- 页码：4903-4907
- 全文大小：922 KB
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Optical and Electronic Materials
Characterization and Evaluation Materials
Electronics, Microelectronics and Instrumentation
Solid State Physics and Spectroscopy - 出版者：Springer Boston
- ISSN：1543-186X
- 卷排序：45
文摘
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 (τf) and permittivity (εr) gradually increased. Consequently, near-zero τf could be obtained for samples with x = 0.08. Excellent microwave dielectric properties with relative permittivity (εr) of 10.92, quality factor (Q × f) of 52,563 GHz (at 12.9 GHz), and temperature coefficient of resonant frequency (τf) 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.