Abstract—
Magnesium aluminate spinel (MgAl2O4) ceramics have been subjected to hot isostatic pressing. The process led to a 0.28% increase in the density of the ceramics compared to samples prepared by primary hot pressing. IR spectroscopy has been used to evaluate structural changes in the densified material. In the IR reflection spectrum measured from 40 to 1000 cm–1, the increase in density showed up as a decrease in the intensity of some bands due to isolated vibrational modes in the MgO4 and AlO4 tetrahedra. The effect was attributed to vibrational mode mixing in the tetrahedral structural units in the densified ceramics. This finding indicates that consolidation of the material is accompanied by an increase in the inner connectivity of crystallites. At the same time, the frequency and intensity of the stretching modes of the Al–O groups in the AlO6 octahedra remained unchanged after isostatic pressing, suggesting that the heat treatment caused no stoichiometric distortion.
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Dunaev, A.A., Eron’ko, S.B., Ignatenkov, B.A. et al. Hot Isostatic Pressing-Induced Structural Changes in MgAl2O4 Ceramics. Inorg Mater 59, 526–529 (2023). https://doi.org/10.1134/S0020168523050035
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DOI: https://doi.org/10.1134/S0020168523050035