Abstract
The crystallization mechanism in a modified Li2O‐Al2O3‐SiO2glass containing P2O5 nucleating agent was investigated by transmission electron microscopy, X‐ray diffraction, and differential thermal analysis. During an initial 1000°C treatment P205 and Li2O react to precipitate Li3PO4 crystallites. At lower temperatures cristobalite, lithium metasilicate, and lithium disilicate crystallize by epitaxial growth on those Li3PO4crystallites. Crystallographic orientation relations for epitaxy were determined by electron diffraction, and lattice misfits were found to be in the range –5.3 to +3.8%. These results provide the first direct proof that glass‐ceramics can crystallize by epitaxial growth on heterogeneous nuclei formed from intentionally added nucleating agents.
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