An anomalous thermal expansion in the perovskite system,Gd1−xSrxMnO3 (0 ≤ x ≤ 0.3) |
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| Affiliation: | 1. Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Hong Kong, China;2. Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Hong Kong, China;1. School of Pharmaceutical and Chemical Engineering, Taizhou University, Jiaojiang, 318000, China;2. Department of Chemistry, University of Waterloo, Ontario, N2L 3G1, Canada;3. College of Energy & Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China;4. College of Materials Science and Engineering, China Jiliang University, Hangzhou, 310018, China;1. Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China;2. Department of Chemical and Biomolecular Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China |
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| Abstract: | The thermal expansion behavior of sintered samples of Gd1−xSrxMnO3 (X = 0.0–0.4) was studied. The sintered bodies in this system showed negative thermal expansion over a wide temperature range. The detailed crystal structure refinements with respect to temperature showed that the volume of the orthorhombic perovskite lattice monotonically increased with temperature, however, in addition to this, the release of distortion from the Jahn-Teller effect of Mn3+ ion occurred over a wide temperature range, which brought the negative expansion of the a-axis, although the b- and c-axes increased with temperature. The anomalous thermal expansion is explained by the sum of the effects of the shrinkage of the a-axis and absorption of the b- and c-axes' expansion by the pores in the sintered body. |
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