Mechanical Activation and Cation Site Disorder in MgAl2O4

Cole A. Corlett; Matthias D. Frontzek; Nina Obradovic; Jeremy L. Watts; William G. Fahrenholtz

doi:10.3390/ma15186422

Mechanical Activation and Cation Site Disorder in MgAl₂O₄

Cole A. Corlett, Matthias D. Frontzek, Nina Obradovic, Jeremy L. Watts, William G. Fahrenholtz

Powder Diffraction

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

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.

Original language	English
Article number	6422
Journal	Materials
Volume	15
Issue number	18
DOIs	https://doi.org/10.3390/ma15186422
State	Published - Sep 2022

Funding

This research was partially funded by the Enabling Materials for Extreme Environments signature area at Missouri S&T. The research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.

Funders	Funder number
Office of Science
Oak Ridge National Laboratory

Keywords

inversion
mechanical activation
neutron diffraction
spinel

Access to Document

10.3390/ma15186422

Cite this

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AB - 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.

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