High‐Temperature Phase Relations in the System Gd2O3‐Ta2O5

Yoshiyuki Yokogawa, Nobuo Ishizawa, Shigeyuki Sōmiya, Masahiro Yoshimura

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The Phase relations of the system Gd2O3‐Ta2O5 in the composition range 50 to100 mol% Gd2O3 was studied by solidstate reactions at 1350°, 1500°, or 1700°C and by thermal analyses up to the melting temperatures. Weberite‐type orthorhombic phase (W2 phase, space group C2221) with the composition of Gd3 TaO7 seems to melt incongruently; at about 2040°C, although this Gd3TaO7 Phase was previously reported to melt congruently. A new fluorite‐type cubic phase (F phase, space group Fm3m) was found for the first time above 1500°C in the system. It melts congruently with the composition of about 80mol% Gd2O3at 2318° 3°C. A phase diagram was proposed for the system Gd2O3–Ta2O5 in the Gd2O3–rich portion

Original languageEnglish
Pages (from-to)2073-2076
Number of pages4
JournalJournal of the American Ceramic Society
Volume74
Issue number9
DOIs
Publication statusPublished - 1991 Sep

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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