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Synthesis of MgAl2O4 Spinel in a Thermal Plasma

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Inorganic Materials Aims and scope

Abstract—

In this paper, we report an experimental study concerned with the synthesis of MgAl2O4 spinel via plasma-assisted melting of powder components at an Al2O3/MgO weight ratio varied from 1 to 4. The presence of excess Al2O3 in the starting mixture has been shown to cause the characteristic Bragg peak 111 (~65°) of crystalline MgAl2O4 to shift to larger 2θ angles and broaden. According to scanning electron microscopy results, the surface microstructure of the synthesized materials is formed by densely packed octahedral stoichiometric MgAl2O4 crystals ranging in size from 10 to 500 μm. The materials have been found to contain local regions that allow the dynamics of crystal growth during melt solidification to be examined. The proposed spinel synthesis method can find application in the fabrication of small thermally stable parts by casting.

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ACKNOWLEDGMENTS

In this study, we used equipment at the Tomsk Shared Materials Research Instrumentation Center, a part of the Tomsk Regional Shared Instrumentation Center, Tomsk State University.

Funding

This work was supported by the Russian Federation Ministry of Science and Higher Education (state research target no. FEMN-2023-0003) and the Russian Federation President’s Grants Council (grant no. MK-66.2022.4).

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Authors and Affiliations

  1. Tomsk State University of Architecture and Civil Engineering, 634003, Tomsk, Russia

    V. V. Shekhovtsov, N. K. Skripnikova & A. B. Ulmasov

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  1. V. V. Shekhovtsov
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  2. N. K. Skripnikova
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  3. A. B. Ulmasov
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Correspondence to V. V. Shekhovtsov.

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Translated by O. Tsarev

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Shekhovtsov, V.V., Skripnikova, N.K. & Ulmasov, A.B. Synthesis of MgAl2O4 Spinel in a Thermal Plasma. Inorg Mater 59, 851–857 (2023). https://doi.org/10.1134/S0020168523080149

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  • DOI: https://doi.org/10.1134/S0020168523080149

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