Abstract
It is established that solid-phase crystallization of beryllian indialite (BI), obtained by heating a sol-gel precursor of the initial compound of nonstoichiometric composition Mg1.81Be1.09Al2.27Si5.85O18, occurs through the following successive reconstructive transformation: phase with a quartz structure → phase with a petalite structure → BI. It is found that metastable phases with quartz and petalite structures, filled with excess cations, are transformed into equilibrium BI, which has no cationic excess, during this process. It is revealed that the structural aspect of the relationship between the phases involved in the transformation is in the inheritance of a hollow Si6O18 ring of preceding phase by subsequent phases and in the edge aggregation of polyhedra. The chemical relationship is in the approximately identical amounts of all species-forming components in the phase compositions.
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Original Russian Text © S.G. Mamontova, M.A. Mikhailov, T.V. Demina, O.Yu. Belozerova, L.A. Bogdanova, 2015, published in Kristallografiya, 2015, Vol. 60, No. 1, pp. 21–27.
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Mamontova, S.G., Mikhailov, M.A., Demina, T.V. et al. Crystallochemical aspect of the substance in the amorphous gel-crystalline Mg-Be-Al silicate series under solid-state conditions. Crystallogr. Rep. 60, 16–22 (2015). https://doi.org/10.1134/S1063774515010137
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DOI: https://doi.org/10.1134/S1063774515010137