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Subsolidus relations and liquidus boundaries in the Ta2O3-WO3-SiO2 system at temperatures ranging from 1200°C to 1500°C were investigated. Phase diagrams were constructed. Compounds with stoichiometries of Ta22W4O67, Ta2WO8 and Ta16W18O94 formed in the Ta2O5-WO3 subsystem at 1200°C. SiO2 was compatible with each of the compounds. A solid solution with a formula of (1−x) Ta2O5·xWO3 formed on the Ta...
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