Phase Transformations in Dicalcium Silicate: II, TEM Studies of Crystallography, Microstructure, and Mechanisms

Young Joong Kim, Ian Nettleship, Waltraud M. Kriven

Research output: Contribution to journalArticle

Abstract

The crystallography, microstructures, and phase transformation mechanisms in dicalcium silicate (Ca2SiO4) were studied by TEM. Three types of superlattice structures were observed in the α′L and β phases. Almost all β grains were twinned and strained. Symmetry‐related domain structures inherited from previous high‐temperature transformations were observed in β grains. Both the α→α′H and α′L→β transformations were considered to be ferroelastic, and spontaneous strains were calculated. In terms of the crystal structures, the major driving force for the β→γ transformation is proposed to be strains and cation charge repulsions in the β structure. This mechanism can be displacive, but it needs to overcome a comparatively high energy barrier.

Original languageEnglish (US)
Pages (from-to)2407-2419
Number of pages13
JournalJournal of the American Ceramic Society
Volume75
Issue number9
DOIs
StatePublished - Sep 1992

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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