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 language||English (US)|
|Number of pages||13|
|Journal||Journal of the American Ceramic Society|
|State||Published - Sep 1992|
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry