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Crystallization of a Glass‐Ceramic by Epitaxial Growth
Author(s) -
HEADLEY T.J.,
LOEHMAN R.E.
Publication year - 1984
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1984.tb19606.x
Subject(s) - crystallite , crystallization , epitaxy , nucleation , materials science , transmission electron microscopy , crystallography , electron diffraction , differential thermal analysis , crystal growth , ceramic , cristobalite , chemical engineering , mineralogy , diffraction , chemistry , composite material , metallurgy , nanotechnology , optics , physics , quartz , organic chemistry , layer (electronics) , engineering
The crystallization mechanism in a modified Li 2 O‐Al 2 O 3 ‐SiO 2 glass containing P 2 O 5 nucleating agent was investigated by transmission electron microscopy, X‐ray diffraction, and differential thermal analysis. During an initial 1000°C treatment P 2 0 5 and Li 2 O react to precipitate Li 3 PO 4 crystallites. At lower temperatures cristobalite, lithium metasilicate, and lithium disilicate crystallize by epitaxial growth on those Li 3 PO 4 crystallites. 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.