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Shock-induced cation disorder in magnesium aluminate spinel.
- Source :
-
Journal of Applied Physics . Dec2010, Vol. 108 Issue 11, p113522. 5p. 1 Color Photograph, 6 Graphs. - Publication Year :
- 2010
-
Abstract
- An increase in lattice constants and an order-disorder phase transition were observed in the magnesium aluminate spinel (MgAl2O4) powders after shock compression. Theoretical calculations on the basis of density functional theory confirm that the remarkable volume expansion in shocked MgAl2O4 powders is closely related to the substantial site disorder in the MgAl2O4 lattice. The calculations also show that the partially inverse MgAl2O4 spinel with an inversion index of 0.7 represents the greatest disordered metastable phase and the most unstable structure. [ABSTRACT FROM AUTHOR]
- Subjects :
- *CATIONS
*MAGNESIUM
*SPINEL
*DENSITY functionals
*PHASE transitions
Subjects
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 108
- Issue :
- 11
- Database :
- Academic Search Index
- Journal :
- Journal of Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 55830644
- Full Text :
- https://doi.org/10.1063/1.3516345