Low temperature fired CaF2-based microwave dielectric ceramics with enhanced microwave properties |
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| Affiliation: | 1. Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, Guangdong, China;2. Shenzhen Engineering Research Center for Novel Electronic Information Materials and Devices & Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices, Southern University of Science and Technology, Shenzhen 518055, Guangdong, China;3. Guangdong Fenghua Advanced Technology Holding Co., Ltd, Zhaoqing, Guangdong 526000, China;1. College of Electronics Information, Hangzhou Dianzi University, Hangzhou 310018, China;2. Department of Physics, University of Peshawar, 25120, KP, Pakistan;3. Department of Physics, Abdul Wali Khan University, Mardan, 23200, Pakistan;4. Mechanical and Industrial Engineering Department, Applied Science Private University, 11931, Amman, Jordan;5. School of Engineering and the Built Environment, Edinburgh Napier University, Edinburgh EH10 5DT, United Kingdom;6. School of Material Science and Energy Engineering, Foshan University, Foshan, Guangdong 528000, China;7. Shenzhen Institute of Advanced Electronic Materials, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China;1. Guangxi Universities Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices, Guangxi Key Laboratory of Optical and Electronic Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China;2. College of Science, Guilin University of Technology, Guilin 541004, China;3. College of Materials and Chemical Engineering, Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, China Three Gorges University, Yichang 443002, China;1. School of Optical and Electronic Information, Key Lab of Functional Materials for Electronic Information (B) of MOE, Huazhong University of Science and Technology, Wuhan, PR China;2. Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, PR China;3. Wenzhou Advanced Manufacturing Institute, Huazhong University of Science and Technology, Wenzhou, PR China;4. College of Material Science and Engineering, Guilin University of Technology, Guilin 541004, PR China;5. Department of Mechanical and Construction Engineering, Faculty of Engineering and Environment, Northumbria University at Newcastle, Newcastle upon Tyne NE1 8ST, UK;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. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 611731, China;2. National Engineering Research Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China, Chengdu 611731, China;3. School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China;4. Department of Mechanical Engineering, National University of Singapore, 117575, Singapore;5. Department of Materials Science and Engineering, University of California Berkeley, Berkeley, CA 94720, United States;6. School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China;1. Laboratory of Dielectric Materials, School of Materials Science & Engineering, Zhejiang University, Hangzhou, 310027, China;2. College of Electronic Information and Engineering, Hangzhou Dianzi University, Hangzhou, 310018, China |
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| Abstract: | Low-temperature-fired microwave ceramics are key to realizing the integration and miniaturization of microwave devices. In this study, a facile wet chemical method was applied to synthesize homogenous nano-sized CaF2 powders for simultaneously achieving low-temperature sintering and superior microwave dielectric properties. Pure CaF2 ceramics sintered at 950 °C for 6 h with good microwave dielectric properties (εr = 6.22, Q×f = 36,655 GHz, and τf = ?102 ppm/°C) was achieved. The microwave dielectric properties of the CaF2 ceramics were further improved by introducing LiF as a sintering aid. The sintering temperature of CaF2-based ceramics was effectively lowered from 950 °C to 750 °C with 10 wt% LiF doping, and excellent microwave dielectric properties (εr = 6.37, Q×f = 65,455 GHz, and τf = ?71 ppm/°C) were obtained. |
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| Keywords: | LTCC Microwave dielectric properties |
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