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Electron Channeling X-ray Microanalysis for Cation Configuration in Irradiated Magnesium Aluminate Spinel

Published online by Cambridge University Press:  10 February 2011

S. Matsumura ,
T. Soeda ,
N. J. Zaluzec  and
C. Kinoshita
S. Matsumura
Affiliation:
Department of Applied Quantum Physics and Nuclear Engineering Kyushu University 36, Fukuoka 812-8581, Japan, [email protected]
T. Soeda
Affiliation:
Department of Applied Quantum Physics and Nuclear Engineering Kyushu University 36, Fukuoka 812-8581, Japan, [email protected]
N. J. Zaluzec
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
C. Kinoshita
Affiliation:
Department of Applied Quantum Physics and Nuclear Engineering Kyushu University 36, Fukuoka 812-8581, Japan, [email protected]
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Abstract

High angular resolution electron channeling x-ray spectroscopy (HARECXS) was examined as a practical tool to locate lattice-ions in spinel crystals. The orientation dependent intensity distribution of emitted x-rays obtained by HARECXS is so sensitive to lattice-ion configuration in the illuminated areas that the occupation probabilities on specific positions in the crystal lattice can be determined accurately through comparison with the theoretical rocking curves. HARECXS measurements have revealed partially disordered cation arrangement in MgO·nAl2O3 with n= 1.0 and 2.4. Most A13+ lattice-ions occupy the octahedral (VI) sites with 6-fold coordination, while Mg2+ lattice-ions reside on both the tetrahedral (IV) and the octahedral (VI) sites. The structural vacancies are enriched in the IV-sites. Further evacuation of cations from the IV-sites to the VI-sites is recognized in a disordering process induced by irradiation with 1 MeV Ne+ ions up to 8.9 dpa at 870 K.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 589 , 1999 , 129
Copyright
Copyright © Materials Research Society 2001

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