Colossal permittivity in Ta-doped SrTiO3 ceramics induced by interface effects and defect structure: An experimental and theoretical study |
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| Affiliation: | 1. School of Microelectronics, Tianjin University, Tianjin, 300072, PR China;2. Tianjin Key Laboratory of Imaging and Sensing Microelectronic Technology, Tianjin University, Tianjin, 300072, PR China;3. Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin, 300072, PR China;1. Spectroscopy Department, Physics Research Institute, National Research Center, 12311, 33 Elbehouth st., Dokki, Cairo, Egypt;2. Department of Physics, Faculty of Science, Mansura University, Mansoura, 35516, Egypt;1. School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou, 310018, People''s Republic of China;2. College of Textile Science and Engineering, Zhejiang Sci-Tech University, Hangzhou, 310018, People''s Republic of China;3. The Key Lab of Industrial Textile Material and Manufacturing Technology, Zhejiang Province, Hangzhou, 310018, People''s Republic of China;4. Zhejiang Jinda New Materials Co., Ltd., Zhejiang Province, Haining, 314419, People''s Republic of China;1. State Key Laboratory of Transient Optics and Photonics, Xi''an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences (CAS), Xi''an, Shaanxi, 710119, China;2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China;3. Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi, 030006, China;1. School of Materials Science and Engineering, Jiangsu University, Zhenjiang, Jiangsu, 212013, PR China;2. Laboratory for High Performance Transparent Protective Materials of Jiangsu Province, Jiangsu Tiemao Glass Co., Ltd., Nantong, 226600, PR China;1. College of Materials Science and Engineering, Nanjing Tech University, Nanjing, 211816, China;2. Department of Nuclear Medicine, Nanjing First Hospital, Nanjing Medical University, Nanjing, 210006, China;3. Nanjing Haoqi Advanced Materials Co., Ltd., Nanjing, 211300, China;1. College of Electromechanical Engineering, Shandong Engineering Laboratory for Preparation and Application of High-performance Carbon-Materials, Qingdao University of Science & Technology, Qingdao, 266061, China;2. State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University, Qingdao, 266061, China;3. School of Chemistry and Materials Science, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, 310024, China;4. State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China |
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| Abstract: | The lack of systematic research on the phase structure, defect structure, and polarization mechanism hinders the full comprehension of the colossal permittivity (CP) behavior for SrTiO3-based ceramics. For this purpose, Ta-doped SrTiO3-based ceramics were synthesized in an N2 atmosphere with a traditional method. When the appropriate amount of Ta was doped, colossal permittivity (ԑr ∼ 62505), low dielectric loss (tanδ ∼ 0.07), as well as excellent temperature stability (−70 °C–180 °C, ΔC/C25°C ≤ ±15%) were obtained in the Sr0.996Ta0.004TiO3 ceramic. The relationship between Ta doping, polarization mechanism, and dielectric performance was systematically researched according to experimental analysis and theoretical calculations. The first-principle calculations indicate that the Ta5+ ion prefers to replace the Sr-site. The defect dipoles and oxygen vacancies formed by heterogeneous-ion doping play an active role in regulating the dielectric performance of ceramics. In addition, the interface barrier layer capacitance (IBLC) effect associated with semi-conductive grains and insulating grain boundaries is the primary origin of colossal permittivity for Sr1-xTaxTiO3 ceramics. The polarization mechanism and defect structure proposed in the study can be extended to the research of SrTiO3 CP ceramics. The results have a good development prospect in colossal permittivity (CP) materials. |
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| Keywords: | Colossal permittivity Defect structure Polarization mechanism Dielectric properties |
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