It is known that the introduction of small Na2O additives (up to 5 mol. %) into the glass composition of the ZnO–MgO–Al2O3–SiO2 (ZMAS) does not interfere with the production of zinc spinel (ZnAl2O4) based glass-ceramic and allows the usage of ion exchange for further improve their mechanical properties. In this work, the submicrostructure of ZMAS glass-ceramic with sodium oxide additives in a transparent state and at the initial stages of opalescence and opacity was studied using the TEM method using XRD data. The main crystalline phase, zinc spinel, embedded in the glass-ceramic, does not contain sodium cations: they remain in the residual glass phase, creating favorable conditions for the strengthening of the material by ion exchange. After heat treatment of glass for 10 h in the temperature range 770…790 °C, in addition to zinc spinel, zinc-magnesium silicate (Zn, Mg)2SiO4 crystallizes, the particle sizes of which reach 15…20 nm, while the sizes of ZnAl2O4 crystals do not exceed 6 nm, and therefore it is the silicate phase that limits the conditions of crystallization and prevents the improvement of strength properties and preservation of transparency.
Ivan A. Veselov – postgraduate student, Mendeleev University of Chemical Technology of Russia (MUCTR), Moscow, Russia
Georgy Yu. Shakhgildyan – Candidate of Chemical Sciences, Associate Professor, Mendeleev University of Chemical Technology of Russia (MUSTR), Moscow, Russia
Vitaliy I. Savinkov – Candidate of Technical Sciences, associate of the Department of Chemical Technology of Glass and Glass-Ceramics, Mendeleev University of Chemical Technology of Russia (MUSTR), Moscow, Russia
Elena N. Subcheva – senior research engineer, Sirius University of Science and Technology, Sochi, Russia
Vladimir N. Sigaev – Doctor of Chemical Sciences, Professor, head of the Department of Chemical Technology of Glass and Glass-Ceramics, Mendeleev University of Chemical Technology of Russia (MUSTR), Moscow, Russia
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DOI: 10.14489/glc.2026.03.pp.003-008
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