Abstract
Glasses of the 6Na2O · хB2O3 · (86 – x)SiO2 · 8Fe2O3 compositions, where x varies from 16 to 31 mol %, are studied by X-ray powder diffractometry and dilatometry. The glasses were preliminarily held at a temperature of 550°C for 8–144 h. It is determined that there are crystalline phases of magnetite and hematite in the studied glasses in addition to the amorphous component. The hematite content gradually decreases as the amount of SiO2 increases and it completely disappears when the SiO2 concentration is higher than 65 mol %. As the duration of the heat treatment increases, the amount of magnetite does not change. At the maximum duration of the heat treatment (144 h), crystallization of the silica phases—tridymite and cristobalite—is observed for all the studied glasses. The stability of the glass transition temperature of all glasses with an increase of the duration of the heat treatment indicates that the coexisting phases of phase-separated glass reach their equilibrium compositions after 8 hours. The crystallization of silica in the glasses is accompanied by a decrease in the glass transition temperature of the low-viscosity phase.
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REFERENCES
Konon, M.Yu., Phase separation and physicochemical properties of glasses of Na2O-B2O3-SiO2-Fe2O3 system, Cand. Sci. (Chem.) Dissertation, St. Petersburg, 2016.
Konon, M., Stolyar, S., Polyakova, I., Drozdova, I., Semenova, E., and Antropova, T., Phase-separated and porous glasses in Na2O–B2O3–SiO2–Fe2O3 glass forming system, Eur. J. Glass Sci. Technol., 2019, vol. 60, no. 3, pp. 115–124.
Konon, M., Antropova, T., Polyakova, I., Anfimova, I., Dikaya, L., Semenova, E., and Kurilenko, L., The phase separation phenomenon in the Na2O–B2O3–SiO2–Fe2O3 glass-forming system and its application for producing porous glasses, Opt. Appl., 2019, vol. 49, no. 3, pp. 437–444.
Antropova, T.V., Pshenko, O.A., Anfimova, I.N., and Drozdova, I.A., Production method of composite multiferroic based on ferromagnetic porous glass, RF Patent no. 2594183, Byull. Izobret., 2016, no. 22.
Voevodina, I.N., Marchenko, Ya.Yu., Nikolaev, B.P., and Yakovleva, L.Yu., Synthesis and magnetic relaxation properties of a porous glass magnetic microcarrier, Russ. J. Appl. Chem., 2012, vol. 85, no. 7, pp. 1083–1089.
Volkova, A.V., Ermakova, L.E., Kashpurina, E.A., Pshenko, O.A., and Antropova, T.V., Electrokinetic properties of iron-containing microporous glasses, Glass Phys. Chem., 2016, vol. 42, no. 3, pp. 322–324.
Beall, G.H., Mansfield, G.R., and Schreurs, J.W.H., Method for making porous magnetic glass and crystal–containing structures, US Patent no. 4395271, 1983.
Dvukhfaznye stekla: struktura, svoistva, primenenie (Phase-separated Glass: Structure, Properties, Application), Varshal, B.G., Ed., Leningrad: Nauka, 1991.
Sosman, R.B., The Phases of Silica, New Brunswick, NJ: Rutgers Univ. Press, 1965.
Konon, M.Yu., Stolyar, S.V., Anfimova, I.N., Polyakova, I.G., and Dikaya, L.F., Physicochemical properties of glasses of the Na2O–B2O3–SiO2–Fe2O3 system in the 6Na2O/70SiO2 section, Glass Phys. Chem., 2018, vol. 44, no. 5, pp. 495–497.
Antropova, T.V., Kinetics of corrosion of the alkali borosilicate glasses in acid solutions, J. Non-Cryst. Solids, 2004, vol. 345–346, pp. 270–275.
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This study was supported by the Russian President’s stipend for young scientists and postgraduates (project no. SP-154.2019.1).
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Translated by D. Marinin
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Konon, M.Y., Polyakova, I.G., Stolyar, S.V. et al. Crystallization in Glasses of the Na2O–B2O3–SiO2–Fe2O3 System with a Different SiO2 Content. Glass Phys Chem 46, 646–649 (2020). https://doi.org/10.1134/S1087659620060139
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DOI: https://doi.org/10.1134/S1087659620060139