High‐Temperature Phase Relations in the System Y2O3‐Y2O3·WO3

KIYOSHI KURIBAYASHI, MASAHIRO YOSHIMURA, TATSUO OHTA, TOSHIYUKI SATA

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Abstract

Phase relations in the system Y2O3‐Y2O3·WO3 were studied at >1400°C. Yttrium oxide with the rare‐earth C‐type structure transformed into a hexagonal structure at 2360° and melted at 2400°C. The eutectic between Y2O3 and 3Y2O3·WO3 was 2334°C at ∼90 mol% Y2O. 3Y2O3·WO3 with a rhombohedral structure changed into a cubic phase at 1765° and melted at 2360°; 5Y2O3·2WO3 with a tetragonal structure changed into the cubic phase at 1740°C. This cubic phase was stable at >1740° and had a solid‐solution range of 69 to 75 mol% Y2O3 at 1800°C. 7Y2O3·4WO3 melted incongruently at 2107°C. Y2O3·WO3 with a monoclinic structure (α’phase) transformed into an orthorhombic structure (e phase) at 1470°, then into a tetragonal structure (β phase) at 1600° to 1700°C. This compound melted incongruently at 1706°C. A phase diagram is given.

Original languageEnglish
Pages (from-to)644-647
Number of pages4
JournalJournal of the American Ceramic Society
Volume63
Issue number11-12
DOIs
Publication statusPublished - 1980 Nov

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All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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