Negative thermal expansion coefficient of Sc-doped indium tungstate ceramics synthesized by co-precipitation |
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| Affiliation: | 1. CEA, DEN, DTEC/SECA/LFC, CEA MARCOULE, 30207 Bagnols-sur-Cèze, France;2. CNRS/IN2P3, CENBG, 33175 Gradignan, France;3. CEA, DEN, DRCP/SERA/LCAR, CEA MARCOULE, 30207 Bagnols-sur-Cèze, France;4. CEA, DEN, DTEC/SECA/LCC, CEA MARCOULE, 30207 Bagnols-sur-Cèze, France;1. School of Material Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China;2. Yunnan University, Kunming 650091, China;1. State Key Lab of Luminescent Materials and Devices, Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Device, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, South China University of Technology, Guangzhou 510641, China;2. Experimental Teaching Department, Guangdong University of Technology, Guangzhou 510006, China;1. Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China;2. Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China;3. State Key Laboratory for Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | Co-precipitation was successfully applied to synthesize the Sc3+ doped In2-xScx (WO4)3 (x = 0, 0.3, 0.6, 0.9 and 1.2) compounds. The composition- and temperature-induced structural phase transition and thermal expansion behaviors of Sc3+ doped In2(WO4)3 were investigated. Results indicate that In2-xScx (WO4)3 crystalizes in a monoclinic structure at 300 °C for x ≤ 0.3 and changes into hexagonal structure for x ≥ 0.6. Hexagonal In1.1Sc0.9(WO4)3 displays negative thermal expansion (NTE) with an average linear coefficient of thermal expansion (CTE) of −1.85 × 10−6 °C −1. After sintering at 700 °C and above, a phase transition from hexagonal to orthorhombic phase was observed in In2-xScx (WO4)3 (x ≥ 0.6). Sc3+ doping successfully reduce the temperature-induced phase transition temperature of In2-xScx (WO4)3 ceramics from 250 °C (x = 0) to room temperature (x = 0.9). When x = 0.9 and 1.2, the average linear CTEs of In2-xScx (WO4)3 ceramics are −5.45 × 10−6 °C−1 and -4.43 × 10−6 °C−1 in a wider temperature range of 25–700 °C, respectively. |
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| Keywords: | Indium tungstate Co-precipitation Negative thermal expansion Phase transition |
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