Abstract—
We have studied general aspects of combustion of mixtures intended for synthesis of fluorophlogopite-based mica and differing in magnesium oxide content. Synthesis was conducted under atmospheric conditions with the use of mineral raw materials. SiO2 + Mg + MgO + Al + Na3AlF6 + KClO4 starting mixtures differing in composition were burnt in quartz beakers 23 mm in diameter and 60–70 mm in height. We examined the effect of magnesium oxide concentration in the starting mixture on the combustion speed and temperature and the amount of material ejected from the reaction mixture (weight loss). The results demonstrate that increasing the amount of MgO in the starting mixture to ~19% reduces the combustion speed from 3.5 to 0.5 mm/s and lowers the combustion temperature from 1400 to 700°C. In addition, the weight loss of the reaction mixture drops to 2%. We have studied the structure and composition of the synthesized material and determined the starting-mixture composition ensuring synthesis of a fluorophlogopite-based material. The composition of the synthesized potassium sodium fluorophlogopite-based material is КMg2.75Si3.5Al0.5O10F2–Na4Mg6Si4Al4O20F4.
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ACKNOWLEDGMENTS
In this work, we used equipment at the Distributed Shared Research Facilities Center, Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences.
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Kachin, A.R., Loryan, V.E. General Aspects of the Synthesis of a Fluorophlogopite-Based Crystalline Mica Material under Atmospheric Conditions. Inorg Mater 58, 1197–1202 (2022). https://doi.org/10.1134/S0020168522110061
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DOI: https://doi.org/10.1134/S0020168522110061