High‐Temperature Phase Transition of Y4Al2O9

Hisanori Yamane, Mamoru Omori, Akira Okubo, Toshio Hirai

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36 Citations (Scopus)

Abstract

Reversible thermal phase transition was observed for Y4Al2O9 at 1377°C with a hysteresis width of 78°C using differential scanning calorimetry. The enthalpy of the transition (ΔH) was about 300 cal/mol. Powder X‐ray diffraction peaks of the high‐temperature phase, as well as the peaks of the low‐temperature phase, were characterized with a monoclinic unit cell. Thermal hysteresis was also confirmed by the temperature dependence of the lattice parameter. The unit cell volume of the high‐temperature phase was 0.5% smaller than that of the low‐temperature phase at 1400°C.

Original languageEnglish
Pages (from-to)2382-2384
Number of pages3
JournalJournal of the American Ceramic Society
Volume76
Issue number9
DOIs
Publication statusPublished - 1993 Sep

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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