The effect of non-equimolar doping on the preparation and electrical conductivity of Sr(Ti,Zr,Zn,Sn,Hf)O3-σ high entropy perovskite oxide |
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| Affiliation: | 1. Yantai University, Yantai, 264005, Shandong, China;2. Department of Physics and Astronomy, KU Leuven, 3001, Leuven, Belgium;3. School of Materials Science and Engineering, University of Jinan, Jinan, 250022, China;4. Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan, 250061, China;5. School of Materials Science and Physics, China University of Mining and Technology, Xuzhou, 221116, China;1. Faculty of Dentistry, University of Toronto, 124 Edward St, Toronto, ON, M5G1G6, Canada;2. Department of Comprehensive Dentistry, School of Dentistry, University of Louisville, 501 S. Preston St., Louisville, KY, 40202, United States;1. Institute of Solid State Chemistry UB RAS, Yekaterinburg, Russia;2. Ural Federal University, Yekaterinburg, Russia;3. Institute of High-temperature Electrochemistry UB RAS, Yekaterinburg, Russia;4. Institute of Solid State Chemistry and Mechanochemistry, Novosibirsk, Russia;1. Henan Key Laboratory of Utilization of Non-metallic Mineral in the South of Henan, Xinyang Normal University, Xinyang, 464000, China;2. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, China;3. Jiangxi Key Laboratory of Surface Engineering, Jiangxi Science and Technology Normal University, Nanchang, 330013, China;1. Departamento de Ingeniería Química, Universitat Jaume I, 12071, Castellón, Spain;2. Instituto Universitario de Tecnología Cerámica, Universitat Jaume I, 12071, Castellón, Spain |
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| Abstract: | A series of high entropy oxides (HEOSs) with non-isomolar ratios of perovskite structures were prepared by ball milling a mixture of SrO, TiO2, ZrO2, ZnO, SnO2 and HfO2 followed by sintering using a high-temperature solid-phase method. Both XRD and TG-DSC results indicate that single-phase Sr(Ti0.2Zr0.2Zn0.2Sn0.2Hf0.2)O3-σ is formed at 1500 °C. According to the SEM-EDS pictures, the elements in the oxide are uniformly distributed with no significant segregation or accumulation. The TEM results show that the polycrystalline ceramic powders can be classified as orthogonal Pbnm perovskite structure. The electrical conductivity (σ) was measured by the EIS technique and the activation energy (Ea) of HEOSs is calculated. In the temperature range of 300–750 °C, Sr(Ti0.28Zr0.18Zn0.18 Sn0.18 Hf0.18)O3-σ exhibits the highest conductivity (2.41 × 10?3 S/cm) and the lowest activation energy (Ea = 0.57 eV) due to lattice distortion and oxygen vacancy concentration. |
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| Keywords: | High entropy oxide Non-isomolar ratio Perovskite structure Electrical conductivity |
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