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. 2022 Sep 16;15(18):6422.
doi: 10.3390/ma15186422.

Mechanical Activation and Cation Site Disorder in MgAl2O4

Cole A Corlett  1 , Matthias D Frontzek  2 , Nina Obradovic  3 , Jeremy L Watts  1 , William G Fahrenholtz  1
Affiliations

Mechanical Activation and Cation Site Disorder in MgAl2O4

Cole A Corlett et al. Materials (Basel). .

Abstract

The synthesis and crystallographic site occupancy were investigated for MgAl2O4 with and without mechanical activation of the precursor powders. Heating to 1200 °C or higher resulted in the formation of a single spinel phase regardless of whether the powders were mechanically activated or not. Neutron diffraction analysis was used to determine cation site occupancy and revealed that mechanical activation resulted in a lower degree of cation site inversion compared to the nonactivated materials, which indicated that the powders were closer to thermodynamic equilibrium. This is the first study to characterize the effects of mechanical activation on crystallographic site occupancy in magnesium aluminate spinel using neutron diffraction.

Keywords: inversion; mechanical activation; neutron diffraction; spinel.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
XRD patterns of the heat-treated MA (A) and XD (B) powders.
Figure 2
Figure 2
Representative neutron diffraction pattern for XD1500C with the Rietveld refinement fit. The black line is the residual (measured—calculated) plotted on a different scale than the pattern above).
Figure 3
Figure 3
Inversion parameter vs. calcination temperature plotted for the spinel powders.
See this image and copyright information in PMC

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