Phase evolution and microwave dielectric properties of SrTiO3 added ZnAl2O4–Zn2SiO4–SiO2 ceramics |
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| Affiliation: | 1. College of Physics and Information Technology, Shaanxi Normal University, Xi''an 710062, China;2. College of Mechanics and Optoelectronic Physics, Anhui University of Science and Technology, Huainan 232001, China;1. Department of Materials Science and Engineering, Xiamen University, Xiamen, 361005, China;2. Department of Physics, Beijing Key Lab of Metamaterials and Devices and Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Beijing Advanced Innovation Center for Imaging Technology, Capital Normal University, Beijing 100048, People''s Republic of China;3. Department of Electronic and Electrical Engineering, University of Chester, Chester, CH2 4NU, United Kingdom;4. School of Engineering and Material Sciences, Queen Mary, University of London, London, E1 4NS, United Kingdom;5. China Electronic Product Reliability and Environmental Testing Research Institute, No.110 Dongguanzhuang Road, Guangzhou, 510610, 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;1. College of Electrical and Information Engineering, Hunan University, Changsha, 410082, China;2. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, China;3. National Engineering Research Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China, Chengdu, 610054, China;4. School of Physics and Electronics, Hunan University, Changsha, 410082, China |
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| Abstract: | Phase evolution and microwave dielectric properties of SrTiO3 added ZnAl2O4–3Zn2SiO4–2SiO2 ceramics system were investigated. With the addition of SrTiO3, the sintering temperature for dense ceramic is reduced from 1320 °C to 1180–1200 °C. According to the nominal composition ZnAl2O4–3Zn2SiO4–2SiO2-ySrTiO3, phase evolution is revealed by XRD patterns and Back Scattering Electron images: Zn2SiO4, ZnAl2O4 and SiO2 phases coexist at y = 0; SrTiO3 reacts with ZnAl2O4 and SiO2 to form SrAl2Si2O8, TiO2 and Zn2SiO4 at y = 0.2 to 0.8, and SiO2 phase disappears at y = 0.8; new phase of Zn2TiO4 is obtained at y = 1. The existence of TiO2 has important effect on the dielectric properties. The optimized microwave dielectric properties are obtained at y = 0.6 and the ceramics show low dielectric constant (7.16), high-quality factor (57, 837 GHz), and low temperature coefficient of resonant frequency (?30 ppm °C?1). |
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| Keywords: | Microwave dielectric properties Ceramic Phase evolution |
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