Densification,microwave dielectric properties and rattling effect of LiYbO2 ceramics with low εr and anomalous positive τf |
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| Affiliation: | 1. College of Materials and Chemical Engineering, Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, China Three Gorges University, Yichang 443002, China;2. Guangxi Universities Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices, College of Material Science and Engineering, Guilin University of Technology, Guilin 541004, China;3. Hubei Three Gorges Laboratory, Yichang 443007, China;1. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China;2. Jiangxi Guo Chuang Industrial Park Development Co., Ltd., Ganzhou 341000, China;1. Guangxi Key Laboratory of Optical and Electronic Materials and Devices, College of Material Science and Engineering, Guilin University of Technology, Guilin 541004, China;2. Key Laboratory of Nonferrous Materials and New Processing Technology, Ministry of Education, Guilin University of Technology, Guilin 541004, China;3. Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, College of Materials and Chemical Engineering, China Three Gorges University, Yichang 443002, China;1. Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, College of Materials and Chemical Engineering, China Three Gorges University, Yichang, 443002, China;2. Guangxi Key Laboratory of Optical and Electronic Materials and Devices. College of Material Science and Engineering, Guilin University of Technology, Guilin, 541004, China;3. College of Information Science and Engineering, Guilin University of Technology, Guilin, 541004, China;1. College of Science, Guilin University of Technology, Guilin, 541004, China;2. Guangxi Universities Key Laboratory of Non-Ferrous Metal Oxide Electronic Functional Materials and Devices, College of Material Science and Engineering, Guilin University of Technology, Guilin, 541004, China |
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| Abstract: | LiYbO2 ceramic with tetragonal structure formed only by LiO6] and YbO6] octahedra, exhibited a εr of 13.3 ± 0.2, Q × f of 24,700 ± 500 GHz and an abnormal positive τf of + 38.6 ± 3.0 ppm/°C as sintered at 1100 °C with low relative density of 88 %. Dense ceramic with relative density of 95.1 % was obtained with the addition of 1 wt% LiF when sintered at 1080 °C, exhibiting enhanced microwave dielectric properties of εr = 14.3 ± 0.2, Q × f = 41,200 ± 500 GHz, τf = +56.5 ± 3.0 ppm/°C and αL = 8.5 × 10?6/K. The large positive discrepancy as much as + 45.1 % between measured εr with porosity correction and calculated εr(C-M) using Clausius?Mossotti relations might be due to the rattling effect of Li+, which also led to the positive τf. |
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| Keywords: | Microwave dielectric ceramic Rattling effect |
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