Phase Relations in the System Al2O3─Ce2Si2O7 in the Temperature Range 900° to 1925°C in Inert Atmosphere |
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| Authors: | A. Cuneyt Tas Mufit Akinc |
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| Affiliation: | Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011 |
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| Abstract: | Equilibrium relationships in the system Al2O3-Ce2Si2O7 in inert atmosphere have been investigated in the temperature range 900° to 1925°C. A simple eutectic reaction was found at 1375°C and 51 mol% Ce2Si2O7. A high-low polymorphic transformation in Ce2Si2O7 was observed at 1274°C. New XRD patterns are suggested for both polymorphs of cerium pyrosilicate. The melting point of Ce2Si2O7 was found to be 1788°C. A value for ΔH°m,Ce2Si2O7 of 36.81 kJ/mol was calculated from the initial slope of the experimentally determined liquidus in equilibrium with the pyrosilicate phase. |
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