Lattice structure analysis and optimised microwave dielectric properties of LiAl1-x(Zn0.5Si0.5)xO2 solid solutions |
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Authors: | Xue-Kai Lan Jie Li Zheng-Yu Zou Gui-Fen Fan Wen-Zhong Lu Wen Lei |
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Affiliation: | 1. School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, PR China;2. Key Lab of Functional Materials for Electronic Information (B), Ministry of Education, Wuhan 430074, PR China |
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Abstract: | Low-permittivity LiAl1-x(Zn0.5Si0.5)xO2 microwave dielectric ceramics were prepared by the solid-state reaction method. Single-phase LiAlO2 solid solutions with a tetragonal structure were achieved at x ≤ 0.12. Partial substitution of [Zn0.5Si0.5]3+ for Al3+ could improve the microstructure and prevent from absorbing moisture of pure LiAlO2 ceramics, which slightly increases their relative permittivity (εr). The quality factor (Q × f) and temperature coefficient of resonant frequency (τf) were closely related to the crystallinity and cation disorder of the B-site characterized by the full width at half-maximum of B1(1) –mode assigned to Li–O–Al stretching. The optimum microwave dielectric properties (εr = 6.12, Q × f = 56986 GHz and τf = -122 ppm/°C) were obtained in the sample with x = 0.02 sintered at 1300 °C. |
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Keywords: | Corresponding author. Microwave dielectric ceramics Crystal structure Cation disorder |
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