Abstract—
Magnesium aluminate spinel, MgAl2O4, has been prepared by self-propagating high-temperature synthesis (SHS) in the MgO–Al2O3–Mg(NO3)2 ∙ 6H2O–Al–B system. The composition and structure of the synthesis product have been ascertained by X-ray diffraction, infrared spectroscopy, and scanning electron microscopy. Using time-resolved X-ray diffraction (TRXRD), we have studied the phase formation process during SHS and identified the key reaction paths. The addition of 2–4 wt % boron has been shown to result in the formation of a liquid phase during the combustion process owing to the formation of a low-melting-point boron oxide, favoring the growth of skeletal spinel crystals 1–10 μm in size. Our results demonstrate that the use of a mixture of aluminum and boron as combustible components of the starting mixture and heating at a rate above 100°C/min allow a material containing more than 95 wt % MgAl2O4 spinel to be obtained.
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This work was supported by the Russian Federation Ministry of Science and Higher Education through the state research targets for the Tomsk Scientific Center, Siberian Branch, Russian Academy of Sciences (theme no. 0365-2019-0005) and the Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences (theme no. 45.4).
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Radishevskaya, N.I., Nazarova, A.Y., L’vov, O.V. et al. Self-Propagating High-Temperature Synthesis of MgAl2O4 Spinel. Inorg Mater 56, 142–150 (2020). https://doi.org/10.1134/S0020168520010112
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DOI: https://doi.org/10.1134/S0020168520010112