Solid Solution Range and Microstructures of Melt‐Grown Mullite

W. M. KRIVEN, JOSEPH A. PASK

Research output: Contribution to journalArticlepeer-review

Abstract

The solid solution range of melt‐grown mullite was examined by crystal‐chemical methods. The maximum Al2O3 content as determined by EDX was ∼83.6 wt%, 75 mol%, or the nominal composition 3Al2O3.SiO2. For samples of overall composition 81 to 83 wt% Al2O3, extra lines indicating crystallographic superstructure appeared in Guinier X‐ray patterns. The corresponding TEM microstructure consisted of a mullite matrix finely twinned on (001), the twins being 0.02 to 0.10 μm wide, with oriented exsolution of α‐A12O3, often twinned, also being present. The analogy between mullite superstructure and that of plagioclase feldspars, as well as the relevance of these findings to the SiO2‐Al2O3 metastable phase equilibria are discussed.

Original languageEnglish (US)
Pages (from-to)649-654
Number of pages6
JournalJournal of the American Ceramic Society
Volume66
Issue number9
DOIs
StatePublished - Sep 1983
Externally publishedYes

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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