Microwave Dielectric Properties of Ca_1-x(Li_1/2Sm_1/2)_xTiO₃ Ceramics

Abstract:

Ca1-x(Li1/2Sm1/2)xTiO3 microwave dielectric ceramics in the x range of 0.70 ~ 0.80 were prepared by conventional ceramics fabrication technique. The crystal structure, microstructure and microwave dielectric properties were investigated. The results showed that a single orthorhombic perovskite structure formed within this x range, and the substitution of (Li1/2Sm1/2)2+ ion for Ca2+ ion in A-site has a significant influence on the microwave dielectric properties of the ceramics. With the increase of substitution of (Li1/2Sm1/2)2+ ion with 0.75, the temperature coefficient of resonant frequency τf reaches zero, and it could be attributed that the Sm and Li have a polarizability effect according to its microstructure. The Ca0.25(Li1/2Sm1/2)0.75TiO3 ceramic had a good performance with microwave dielectric properties of τf = 0 ppm/°C, εr = 105.83, and Qf = 3170 GHz.

• Periodical: Advanced Materials Research (Volumes 105-106)
• Pages: 238-241
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.105-106.238
• Online since: April 2010
• Authors: Yue Ming Li, Ting Ting Song, Fei Hu, Run Hua Liao, Bin Zhang
• Keywords: Microwave Dielectric Ceramics, Temperature Coefficient of Resonant Frequency

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