Structure and microwave dielectric properties of novel walstromite-type MCa2Si3O9 (M = Ba,Sr) ceramics |
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| Affiliation: | 1. School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu, 611731, China;2. China Zhenhua Group Yunke Electronic Co. Ltd., Guiyang, 550018, China;3. China Zhenhua Group, Guiyang, 550018, China;1. Department of Ceramic Engineering, IIT BHU, Varanasi, 201005, India;2. Department of Mechanical Engineering, IIT BHU, Varanasi, 201005, India;3. Department of Chemistry, Bar-Ilan Institute for Nanotechnology and Advanced Materials (BINA), Bar-Ilan University, 52900, Ramat Gan, Israel;1. School of Materials and Energy, Southwest University, Chongqing, 400715, China;2. College of Materials Science and Engineering, Sichuan University, Chengdu, 610065, China;1. Basic Sciences Department, Faculty of Engineering, Sinai University, Egypt;2. MEU Research Unit, Middle East University, Amman, Jordan;3. Physics Department, Faculty of Science, Suez Canal University, Ismailia, Egypt;4. Physics Department, Faculty of Science, Zagazig University, Zagazig, Egypt;1. Key Laboratory of Processing and Testing Technology of Glass & Functional Ceramics of Shandong Province, School of Materials Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China;2. School of Material Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China;3. Research and Development Centre, Shandong Advanced Materials Research Institute, Jinan 250102, China |
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| Abstract: | Novel walstromite-type MCa2Si3O9 (M = Ba, Sr) ceramics, with triclinic space group P-1, were prepared through a solid-state reaction method. The P–V-L theory proves that the lattice energy and bond energy of the Si–O bond play a leading role in the quality factor and the dielectric constant is mainly determined by the ionic polarization. Excellent microwave dielectric properties of BaCa2Si3O9 and SrCa2Si3O9 ceramics could be obtained: εr = 8.99 ± 0.23, Q × f = 44,542 ± 500 GHz, and τf = −25.9 ± 3.0 ppm/°C and εr = 7.39 ± 0.23, Q × f = 48,772 ± 500 GHz, and τf = −27.5 ± 3.0 ppm/°C, when sintered at 1240/1280 °C for 4 h. Then SrCa2Si3O9 ceramic is applied to a new microstrip bandpass filter, because of its high microwave dielectric properties and low thermal expansion coefficient. With reduced dimension, the filtering performance of the circuit is also highly improved, including reduced capacitor parasitic effect and the optimized stopband insertion loss. Accordingly, the SrCa2Si3O9 ceramic is a promising candidate for sub-6 GHz a filter of microstrip bandpass applications. |
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| Keywords: | Microwave dielectric ceramics P–V-L theory Microstrip bandpass filter |
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