Crystal structure and performance modification of a novel triclinic CaMgP2O7 microwave dielectric ceramic with low sintering temperature |
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| Affiliation: | 1. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China;2. Key Laboratory of Sensor and Sensing Technology of Gansu Province & Institute of Sensor Technology, Gansu Academy of Sciences, Lanzhou 730000, China;1. School of Microelectronics, Tianjin University, Tianjin 300072, PR China;2. Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin 300072, PR China;3. Tianjin Key Laboratory of Imaging and Sensing Microelectronic Technology, Tianjin University, Tianjin 300072, PR China;1. College of Materials Science and Engineering, Hunan University, Changsha, 410082, China;2. College of Electrical and Information Engineering, Hunan University, Changsha, 410082, China;1. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, China;2. Yangtze River Delta Research Institute of UESTC (Huzhou), Huzhou, 313000, China;1. College of Electronics Information, Hangzhou Dianzi University, Hangzhou 310018, China;2. Department of Physics, Abdul Wali Khan University Mardan, Garden Campus, Mardan 23200, Khyber Pakhtunkhwa, Pakistan;3. Functional Materials and Acousto-Optic Instruments Institute, School of Instrumentation Science and Engineering, Harbin Institute of Technology, Harbin 150080, China |
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| Abstract: | In this study, crystal structure and microwave dielectric properties of phosphate CaMgP2O7 were comprehensively investigated. As a novel microwave dielectric ceramic, CaMgP2O7 consists of highly dense structure with optimal microwave dielectric properties (εr = 7.8 ± 0.124, Q×f = 13,165 ± 836 GHz, and τf = −85.04 ± 1.205 ppm/℃) at a low sintering temperature (950 ℃). The Rietveld refinement of XRD patterns revealed that CaMgP2O7 belongs to a triclinic system with P-1 symmetry type. Moreover, the substitution of Zn2+ for Mg2+ in CaMgP2O7 can further reduce the sintering temperature, effectively promote the densification process, and improve the Q×f value. The effects of porosity (or density) and chemical bond characteristics on the performance of CaMg1-xZnxP2O7 ceramics were carefully analyzed as well. Outstanding performance (εr = 8.05 ± 0.12, Q×f = 20,670 ± 923 GHz, and τf = −87.59 ± 3.24 ppm/℃) can be achieved for the CaMg0.84Zn0.16P2O7 ceramic sintered at 875 ℃ for 3 h. |
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| Keywords: | Structure P-V-L theory Microwave dielectric properties |
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