Thermal expansion properties of Ln2−xCrxMo3O12 (Ln = Er and Y) |
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Authors: | MM Wu ZB Hu YT Liu DF Chen |
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Affiliation: | aChina Institute of Atomic Energy, Beijing 102413, China;bCollege of Chemistry and Chemical Engineering, Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract: | Structures and thermal expansion properties of Ln2−xCrxMo3O12 (Ln = Er and Y) have been investigated by X-ray powder diffraction. Rietveld analysis results of Ln2−xCrxMo3O12 indicate that compounds Er2−xCrxMo3O12 (0 ≤ x ≤ 0.3) and Y2−xCrxMo3O12 (0 ≤ x ≤ 0.2) crystallize in orthorhombic structure and exhibit negative thermal expansion, while both monoclinic and orthorhombic compounds Er2−xCrxMo3O12 (1.7 ≤ x ≤ 2.0) and Y2−xCrxMo3O12 (1.8 ≤ x ≤ 2.0) possess positive coefficient of thermal expansion. The coefficients of linear thermal expansion of orthorhombic Ln2−xCrxMo3O12 change from negative to positive with increasing chromium content. Thermogravimetric and differential scanning calorimetry have been used to study the hygroscopicity and the phase transition temperature. |
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Keywords: | C X-ray diffraction D Crystal structure D Thermal expansion |
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