Bulk and lattice thermal expansion in Ce1−xSrxO2−x (0.0≤x≤0.10) |
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Authors: | S V Chavan S J Patwe A K Tyagi |
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Affiliation: | Applied Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India |
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Abstract: | In this communication, we report on the bulk and lattice thermal expansion studies on a number of compounds, within the homogeneity range of solid solutions, in a series with the general composition Ce1−xSrxO2−x (0.0≤x≤0.10). The XRD pattern of each product was refined to determine the solid solubility of SrO into the lattice of CeO2, and the homogeneity range. The composition with maximum solid solubility limit of SrO in CeO2 lattice, under the slow cooled conditions, was delineated as Ce0.91Sr0.09O1.91 (i.e. 9 mol.% of SrO). The bulk thermal expansion measurements from ambient to 1123 K, as investigated by a dilatometer, revealed that the l (293 to 1123 K) values for the compositions within the homogeneity range increase from 11.58×10−6 to 12.13×10−6 K−1 on increasing the Sr2+ content from 0 mol.% (i.e. CeO2) to 9 mol.%, i.e. the upper solubility limit of SrO into the lattice of CeO2. A similar trend was observed in the lattice thermal expansion coefficients a (293 to 1473 K) as obtained by a high temperature-XRD. |
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Keywords: | Oxides X-ray diffraction Phase equilibria |
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