Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2022

Идентификатор DOI: 10.1134/S0020168522110024

Ключевые слова: bismuth silicate, metastable phases, solidification, heat treatment of melt, eutectoid decomposition

Аннотация: 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.

Журнал: Inorganic Materials

Выпуск журнала: Т.58, №11

Номера страниц: 1168-1178

ISSN журнала: 00201685

Место издания: Москва

Издатель: Pleiades Publishing, Ltd. (Плеадес Паблишинг, Лтд)

• Bermeshev T.V. (Siberian Federal University)
• Zhereb V.P. (Siberian Federal University)
• Bundin M.P. (Siberian Federal University)
• Yasinsky A.S. (IME, Institute for Process Metallurgy and Metal Recycling, RWTH Aachen University)
• Yushkova O.V. (Siberian Federal University)
• Voroshilov D.S. (Siberian Federal University)
• Samoilo A.S. (Siberian Federal University)
• Mazurova E.V. (Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences)
• Zaloga A.N. (Siberian Federal University)
• Yakivyuk O.V. (Siberian Federal University)
• Yur'ev P.O. (Siberian Federal University)

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