Sintering behavior,structural evolution,and dielectric properties of Li2+xMgTiO4Fx microwave dielectric ceramics |
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| Affiliation: | 1. School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China;2. School of Integrated Circuit Science and Engineering, University of Electronic Science and Technology of China, Chengdu, China;3. State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China;4. School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China;1. School of Mathematical and Physical Sciences, Wuhan Textile University, Wuhan 430200, PR China;2. State Key Laboratory of New Textile Materials and Advanced Processing Technologies, Wuhan Textile University, Wuhan 430200, PR China;3. School of Electronic and Electrical Engineering, Wuhan Textile University, Wuhan 430200, PR China;4. School of Optical and Electronic Information, Key Lab of Functional Materials for Electronic Information (B) of MOE, Huazhong University of Science and Technology, Wuhan 430074, PR China;5. Wenzhou Key Laboratory of Microwave Communication Materials and Devices, Wenzhou Advanced Manufacturing Institute of HUST, Wenzhou 325035, PR China;1. School of Advanced Materials and Nanotechnology, Xidian University, Xi''an, Shaanxi, 710071, PR China;2. Academy of Advanced Interdisciplinary Research, Xidian University, Xi''an, Shaanxi, 710071, PR China;1. Yantai University, Yantai, 264005, Shandong, China;2. School of Materials Science and Engineering, University of Jinan, Jinan, 250022, Shandong, China;1. Provincial Key Laboratory of Informational Service for Rural Area of Southwestern Hunan, Shaoyang University, Shaoyang 422000, China;2. College of Information Engineering, Shaoyang University, Shaoyang 422000, China;1. College of Electrical and Information Engineering, Hunan University, Changsha, 410082, China;2. Guangdong Provincial Key Laboratory of Electronic Functional Materials and Devices, Huizhou, 516001, China;3. College of Materials Science and Engineering, Hunan University, Changsha, 410082, China |
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| Abstract: | Herein, the sintering behavior, structural evolution, microstructure, and dielectric properties of Li2+xMgTiO4Fx (0 ≤ x ≤ 5) ceramics were investigated. At x ≤ 0.75, Li2+xMgTiO4Fx ceramics formed a continuous solid solution with a cubic rock salt structure. Subsequently, a composite ceramic of Li2+xMgTiO4Fx and LiF was formed. It was found that the maximum mass percentage of LiF required to fully form a solid solution was between 11% and 13%. The Li2.75MgTiO4F0.75 exhibited the best dielectric properties: εr = 16.52, Q × f = 123,574 GHz, and τf = ?18.11 ppm/°C. The substitution of F- for O2- resulted in a lower sintering temperature of 875 °C, which slightly suppressed the volatilization of Li, and thus optimized the dielectric properties. The decrease in lattice vibration damping behavior and the increase in electron cloud density resulted in lower dielectric losses. The reduction in molecular polarization rate led to a reduction in εr, and the increase in bond energy optimized τf. Good chemical compatibility with Ag electrode was demonstrated, indicating that Li2+xMgTiO4Fx ceramics have unlimited potential for LTCC applications. |
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| Keywords: | Microwave dielectric Cubic rock salt structure First-principles calculation |
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