Phase Relations in the System Bi2O3-WO3 |
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| Authors: | SYED N HODA LUKE L Y CHANG |
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| Affiliation: | Department of Geology, Miami University, Oxford, Ohio 45056 |
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| Abstract: | Phase relations in the system Bi2O3-WO3 were studied from 500° to 1100°C. Four intermediate phases, 7Bi2O3· WO3, 7Bi2O3· 2WO3, Bi2O3· WO3, and Bi2O3· 2WO3, were found. The 7B2O · WO3 phase is tetragonal with a 0= 5.52 Å and c 0= 17.39 Å and transforms to the fcc structure at 784°C; 7Bi2O3· 2WO3 has the fcc structure and forms an extensive range of solid solutions in the system. Both Bi2O3· WO3 and Bi2O3· 2WO3 are orthorhombic with (in Å) a 0= 5.45, b 0=5.46, c 0= 16.42 and a 0= 5.42, b 0= 5.41, c 0= 23.7, respectively. Two eutectic points and one peritectic exist in the system at, respectively, 905°± 3°C and 64 mol% WO3, 907°± 3°C and 70 mol% WO3, and 965°± 5°C and 10 mol% WO3. |
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