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Journal of Electron Microscopy 48(5): 531-536 (1999)
© 1999 Oxford University Press

Quantitative electron diffraction study of cation configuration and irradiation induced displacement in magnesium aluminate spinel crystals

Takeshi Soeda, Syo Matsumura*, Jiro Hayata and Chiken Kinoshita

Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University 36, Fukuoka 812-8581, Japan

*To whom correspondence should be addressed. E-mail: syo{at}nucl.kyushu-u.ac.jp

The electron channelling enhanced X-ray microanalysis and the large angle convergent beam electron diffraction were simultaneously employed to determine cation configuration in magnesium aluminate spinel (MgO·nAl2O3) crystals as a function of composition n and irradiation dose with 1 MeV electrons or 300 keV O+ ions. In as-grown single crystals, about 70% of Mg2+ ions and about 20% of Al3+ ions reside on the tetrahedral sites, while the remaining ions are located on the octahedral sites. The occupation probabilities of ions are almost independent of the value n. Most of structural vacancies are located on the tetrahedral sites in non-stoichiometric compounds with n>1. The cation distribution is hardly changed under irradiation with 1 MeV electrons to 1.9 dpa at 870 K. In contrast, significant displacements of Al3+ ions are induced under irradiation with 300 keV O+ ions to 1.4 dpa at 870 K. The anti-site Al3+ ions on the tetrahedral sites almost vanish under the latter condition of irradiation.

Keywords     energy filtering, LACBED, channelling enhanced X-ray analysis, radiation effects

Received     20 January 1999, accepted 15 July 1999


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