Abstract—
We have studied the effect of heat treatment (isothermal holding in the temperature zone C, initial cooling temperature, and cooling rate) of a melt with the composition 85.7 mol % Bi2O3 + 14.3 mol % SiO2 (6 : 1) on the phase composition and microstructure of the forming crystals and found conditions for crystallization of a δ-Bi2O3-based metastable solid solution (δ*) at high melt cooling rates. The results demonstrate that low melt cooling rates lead to crystallization of the δ*-phase and an α-Bi2O3-based solid solution, followed by partial or complete eutectoid decomposition of dendritic δ*-phase crystals into a mixture of metastable phases, containing β*-Bi2O3 and η-Bi2SiO5 as well. Raising the melt cooling rate limits both the formation of secondary phases and eutectoid decomposition. The results we obtained make it possible to control the formation of polycrystalline Bi12SiO20 and δ-Bi2O3 upon 6Bi2O3⋅SiO2 melt solidification.
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ACKNOWLEDGMENTS
In this study, we used equipment at the Krasnoyarsk Krai Shared Research Facilities Center, Krasnoyarsk Scientific Center (Federal Research Center), Siberian Branch, Russian Academy of Sciences.
We acknowledge the use of equipment at the Knowledge Intensive Methods for Characterization and Analysis of Novel Materials, Nanomaterials, and Mineral Raw Materials Shared Research Facilities Center, Siberian Federal University federal state autonomous educational institution of higher education.
Funding
This work was supported by the Russian Federation Ministry of Science and Higher Education (state research target for Siberian Federal University, project no. FSRZ-2020-0013).
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Bermeshev, T.V., Zhereb, V.P., Bundin, M.P. et al. Effect of Heat Treatment of Molten 6Bi2O3⋅SiO2 on the Phase Composition and Microstructure of Its Solidification Products. Inorg Mater 58, 1168–1178 (2022). https://doi.org/10.1134/S0020168522110024
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DOI: https://doi.org/10.1134/S0020168522110024