Low dielectric loss ceramics in the Mg4Nb2O9-ZnAl2O4-TiO2 ternary system |
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| Affiliation: | 1. Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, Taipei, Taiwan;2. Department of Materials Science and Engineering, National United University, Miaoli, Taiwan;3. Microelectronics and Materials Physics Laboratory, Department of Electrical Engineering, University of Oulu, Oulu, 90014, Finland;4. Department of Resources Engineering, National Cheng Kung University, Tainan, Taiwan;1. State Key Laboratory of Automotive Simulation and Control, Jilin University, PR China;2. Key Laboratory of Automobile Materials (Ministry of Education), School of Materials Science and Engineering, Jilin University, No. 5988 Renmin Street, Changchun, 130022, PR China;1. Bayreuth Engine Research Center (BERC), Department of Functional Materials, University of Bayreuth, 95440 Bayreuth, Germany;2. Institute of Energy Research and Physical Technologies, Clausthal University of Technology, 38640 Goslar, Germany;1. Materials Engineering Department, Tarbiat Modares University, Tehran, Iran;2. Department of Electrical Engineering and Computer Science & Research Center MANSID, Stefan Cel Mare University, Suceava, Romania;1. Key Laboratory of Aero-Engine Thermal Environment and Structure, Ministry of Industry and Information Technology, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, PR China;2. College of Chemical Engineering, Nanjing Forestry University, Nanjing, 210037, PR China;3. Jiangsu Province Key Laboratory of Aerospace Power System, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, PR China;4. State Key Laboratory of Mechanics and Control Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, PR China;5. State Key Laboratory of High Performance Ceramics & Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, PR China;1. WZ AMI of HUST, Wenzhou, 325035, PR China;2. School of Optical and Electronic Information, Key Lab of Functional Materials for Electronic Information (B) of MOE, Huazhong University of Science and Technology, Wuhan, 430074, PR China;3. Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, PR China |
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| Abstract: | This study used a traditional solid-state reaction method to prepare a series of composite ceramics in the 0.7Mg4Nb2O9-(0.3-x)ZnAl2O4-xTiO2 ternary system. Crystalline phases and microstructure of Mg4Nb2O9-ZnAl2O4-TiO2 dielectric ceramic composites were investigated and correlated with the relevant dielectric properties. It was observed that the addition of Ti4+ substituted Nb5+ in the Mg4Nb2O9 structure, which promoted the decomposition of Mg4Nb2O9 to form the second phase, Mg5Nb4O15, during sintering. The synergistic effect of ZnAl2O4-TiO2 co-doping promoted the Mg4Nb2O9 ceramic densification. The sample (0.7Mg4Nb2O9-(0.3-x)ZnAl2O4-xTiO2) with x = 0.15?0.2 exhibited dielectric constants of 13–14, larger than those of ZnAl2O4, Mg4Nb2O9 and Mg5Nb4O15, due to the NbO6 octahedra distortion resulting from the substitution of Al3+/Ti4+ for Nb5+ in Mg4Nb2O9 and Mg5Nb4O15. The long-range order of the NbO6 octahedra was enhanced by co-doping ZnAl2O4 and TiO2, thereby enhancing the Qxf value. A dielectric constant of 13.1, Qxf value of 366,000 GHz and a τf of ?60.8 ppm/°C were obtained from 1300 °C sintered 0.7Mg4Nb2O9-0.15ZnAl2O4-0.15TiO2. These results show that 0.7Mg4Nb2O9-0.15 ZnAl2O4-0.15TiO2 ceramic is a good candidate for microwave electronic device applications. |
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| Keywords: | Dielectric loss Microwave ceramics |
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