Low-temperature crystallization proceeds through overcoming the least energy barriers, which leads to the formation of metastable crystalline phases. Upon prolonged hígh-temperature exposures, recrystallization to stable phases occurs, in accord with the phase diagram.
A close relationship is noted between the structures of the initial glass and the crystalline phases that precipitate first at low temperatures. It is concluded that the structure of the glass with spodumene composition and other glasses with a medium aluminum oxide content (4–17 mol. %) is “eucryptite-like” or “β-quartz.”
The passive role of ions with little ability to fuse in processes of low-temperature crystallization is noted.
The cracking of glass during crystallization is related to the formation of phases of the type β-eucryptite and the β-quartz solid solution.
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Kalinina, A.M., Filipovich, V.N. Study of the sequence of crystallization in the heating of lithium aluminosilicate glasses. Russ Chem Bull 14, 210–217 (1965). https://doi.org/10.1007/BF00845581
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