Microstructure and dielectric properties of high entropy Ba(Zr0.2Ti0.2Sn0.2Hf0.2Me0.2)O3 perovskite oxides |
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| Affiliation: | 1. South Ural State University, 454080, Chelyabinsk, Russia;2. SSPA “Scientific and Practical Materials Research Centre of NAS of Belarus”, 220072, Minsk, Belarus;3. Guangdong University of Technology, Materials and Energy School, Panyu District, Guangzhou, 510006, PR China;4. Xi''an Jiaotong University, Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, School of Electronic Science and Engineering, Xi''an, 710049, China;5. L.N. Gumilyov Eurasian National University, 2, Satpayev Str., 010000, Nur-Sultan, Kazakhstan;1. Department of Materials Science and Engineering, Dalian Key Laboratory of Internal Combustion Engine Tribology and Reliability Engineering, Dalian Maritime University, Dalian 116026, Liaoning, China;2. School of Materials Science and Engineering, Changzhou University, Changzhou 213164, Jiangsu, China;1. State Key Laboratory of Solidification Processing, MIIT Key Laboratory of Radiation Detection Materials and Devices, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China;2. School of Engineering and Materials Science, Queen Mary University of London, London E1 4NS, United Kingdom;3. NPU-QMUL Joint Research Institute of Advanced Materials and Structure, Northwestern Polytechnical University, Xi’an 710072, China;1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan Province, 650093, PR China;2. Key Laboratory of Advanced Materials of Yunnan Province, Kunming University of Science and Technology, Kunming, Yunnan Province, 650093, PR China;1. State Key Laboratory of Solidification Processing, MIIT Key Laboratory of Radiation Detection Materials and Devices, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China;2. School of Engineering and Materials Science, Queen Mary University of London, London E1 4NS, United Kingdom;3. NPU-QMUL Joint Research Institute of Advanced Materials and Structure, Northwestern Polytechnical University, Xi’an 710072, China |
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| Abstract: | A series of high entropy Ba(Zr0.2Ti0.2Sn0.2Hf0.2Me0.2)O3 (Me=Y3+,Nb5+,Ta5+,V5+,Mo6+,W6+) perovskite oxides were synthesized by using a solid state reaction method. Three multiple-cation solid solutions formed pure phase compounds, and only two compounds were sintered into ceramics. Microstructure analysis showed the influence of configurational entropy on phase stability and grain growth. Dielectric measurements showed that the high entropy ceramics possessed decent temperature stability of permittivity from 25 °C to 200 °C, low dielectric loss (<0.002) from 20 Hz to 2 MHz, high resistance and moderate breakdown strength (290 kV/cm, 370 kV/cm). Evidence strongly confirmed that controlling configurational entropy could be a feasible perspective to set up highly tunable perovskite structures and explore novel species of dielectric materials. |
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| Keywords: | High entropy ceramics Phase stability Grain growth Dielectric properties |
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