Microwave dielectric properties of CeO2–0.5AO–0.5TiO2 (A = Ca,Mg, Zn,Mn, Co,Ni, W) ceramics |
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| Affiliation: | 1. Materials & Minerals Division, National Institute of Interdisciplinary Science and Technology, Trivandrum 695019, India;2. Physical Electronics & Materials, London South Bank University, London SE1 0AA, UK;1. Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand;2. National Metal and Materials Technology Center (MTEC), Thailand Science Park, Pathumthani 12120, Thailand;3. Integrated Nanotechnology Research Center (INRC), Khon Kaen University, Khon Kaen 40002, Thailand;4. Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand;5. School of Physics, Institute of Science, Suranaree University, Nakhon Ratchasima 30000, Thailand;1. College of Materials Science and Engineering, Nanjing Tech University, Nanjing Jiangsu, 210009, China;2. Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing Tech University, Nanjing Jiangsu, 210009, China;1. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China;2. Institute of Electronic and Information Engineering, University of Electronic Science and Technology of China, Dongguan 518105, China;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;3. Shen Zhen Zhen Hua Ferrite & Ceramic Electronics Co., Ltd., Shenzhen 518109, PR China;1. National Engineering Research Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China, Chengdu, 610054, China;2. Key Laboratory of Multi-Spectral Absorbing Materials and Structures of Ministry of Education, University of Electronic Science and Technology of China, Chengdu, 610054, China |
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| Abstract: | Microwave dielectric ceramic materials based on cerium CeO2–0.5AO–0.5TiO2 (A = Mg, Zn, Ca, Mn, Co, Ni, W)] have been prepared by a conventional solid state ceramic route. The crystal structure was studied by X-ray diffraction, microstructure by scanning electron microscopy (SEM) techniques and the phase composition was studied using energy dispersive X-ray analysis (EDXA). The sintered ceramics had a relative dielectric constant (ɛr) in the range 17–65 and quality factor Quxf up to 50,000 GHz and a temperature variation of resonant frequency (τf) ranging from a negative value (−62 ppm/°C) to a high positive value (+399 ppm/°C). The majority of the synthesized ceramics were of a two phase composite consisting of a fluorite CeO2 and perovskite ATiO3 phase. The microwave dielectric properties were further tailored by adding various amounts of dopants of different valencies to the calcined powder. This made it possible to either tune τf to zero or improved the quality factor further. |
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