High configurational entropy for low phase transition temperature and thermal expansion of A2M3O12 oxide ceramics |
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| Affiliation: | 1. Henan Key Laboratory of Photovoltaic Materials and Center of Topological Functional Materials, Henan University, Kaifeng, 475004, China;2. Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, 450052, China;3. Key Laboratory for Special Functional Materials of Ministry of Education, School of Materials and Engineering, Henan University, Kaifeng, 475004, China;4. Joint Center for Theoretical Physics, and School of Physics and Electronics, Henan University, Kaifeng, 475004, China;5. Department of Physics, Renmin University of China, Beijing, 100872, China;1. School of Chemistry and Materials Engineering, Huaihua University, Huaihua 418000, China;2. State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510641, China;3. Zhejiang Lab, Hangzhou 311100, China;4. College of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China;5. College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027 China;1. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China;2. Hubei Longzhong Laboratory, Xiangyang, 441000, China;3. Hubei Institute of Aerospace Chemistry Technology, China Aerospace Science and Technology Corporation, Xiangyang, 441000, China;1. Department of Physics, Physics and Chemistry of Materials Laboratory University of M''sila, 28000, M''sila, Algeria;2. Research Unit on Emerging Materials (RUEM), University Ferhat Abbas of Setif 01, 19000, Setif, Algeria;3. Applied Sciences Department, University of Technology- Iraq, Baghdad, Iraq;4. Laboratoire Moltech Anjou Universite d’Angers/UMR CNRS 6200, 2, Bd Lavoisier, 49045, Angers, France;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China;2. Foshan Ceramics Research Institute Group Co., Ltd, Foshan, 528000, China |
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| Abstract: | Transverse vibrations of bridging atoms in framework structure oxides contribute to negative thermal expansion (NTE), increasing the configurational entropy. Herein, the configurational entropy of NTE (Al1/3Fe1/3Cr1/3)2Mo3O12 (AFCM) is tuned by introducing ZrMg and W to AlFeCr and Mo sites to lower NTE. The NTE of ((Zr1/2Mg1/2)x(Al1/3Fe1/3Cr1/3)(1-x))2Mo3O12 (ZMAFCM) reduce obviously with increasing the content of ZrMg and also the phase transition temperatures (PTTs) (x = 0～0.5). For ((Zr1/2Mg1/2)x(Al1/3Fe1/3Cr1/3)(1-x))2(Mo1/2W1/2)3O12 (ZMAFCMW), the NTE and PTTs reduce at a faster rate than that of ZMAFM. The configurational entropy increases with the content of ZrMg firstly (x = 0～0.4) and then decreases. The possible mechanism of thermal expansion change is related to the enhanced lattice configuration, high entropy. The inconsistent transverse vibrations of bridging oxygen atoms could reduce their contribution to NTE, especially for high entropy. The PTT of high configurational entropy oxides is reduced obviously due to the influenced on the effective electronegativity. The investigation paves a high entropy way to lower thermal expansion and PTT of A2M3O12 oxide ceramics and explores the further mechanism of NTE. |
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| Keywords: | Negative thermal expansion Transverse vibration Configurational entropy Phase transition Low thermal expansion 65 40 ?b 65 40 De 65 40 Gr 81 30 ?t |
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