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The nucleation and crystallization of Li 2 O‐Al 2 O 3 ‐SiO 2 glasses containing TiO 2 were investigated using transmission electron microscopy of thin sections produced from bulk samples. Phase separation occurs during cooling from the melt, and on heating, a large number of titanium‐aluminum crystals approximately 50 A in diameter are formed. These crystals are the heterogeneous nuclei for the crystallization of the remaining glass. Photomicrographs of various stages of crystallization show the development of the fine‐grained glass‐ceramic.
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Doherty et al. (1967) studied this question.
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