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Title: Electron channeling X-ray microanalysis for cation configuration in irradiate magnesium aluminate spinel

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{center_dot}nAl{sub 2}O{sub 3} with n = 1.0 and 2.4. Most Al{sup 3+} lattice-ions occupy the octahedral (VIII) sites, while Mg{sup 2} lattice-ions reside on both the tetrahedral (IV) and the octahedral (VIII) sites. The structural vacancies are enriched in the IV-sites. Further evacuation of cations from the IV-sites to the VIII-sites is recognized in a disordering process induced by irradiation with 1 MeV Ne{sup +} ions up to 8.9 dpa at 870 K.

Authors:
; ; ;
Publication Date:
Research Org.:
Argonne National Lab., IL (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
750633
Report Number(s):
ANL/MSD/CP-100801
TRN: US0003351
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Conference
Resource Relation:
Conference: MRS '99 Fall Meeting, Boston, MA (US), 11/29/1999--12/03/1999; Other Information: PBD: 22 Dec 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; MAGNESIUM OXIDES; ALUMINIUM OXIDES; X-RAY SPECTROSCOPY; CRYSTAL LATTICES; VACANCIES; RADIATION EFFECTS; THERMONUCLEAR REACTOR MATERIALS

Citation Formats

Matsumura, S., Soeda, T., Zaluzec, N. J., and Kinoshita, C. Electron channeling X-ray microanalysis for cation configuration in irradiate magnesium aluminate spinel. United States: N. p., 1999. Web.
Matsumura, S., Soeda, T., Zaluzec, N. J., & Kinoshita, C. Electron channeling X-ray microanalysis for cation configuration in irradiate magnesium aluminate spinel. United States.
Matsumura, S., Soeda, T., Zaluzec, N. J., and Kinoshita, C. Wed . "Electron channeling X-ray microanalysis for cation configuration in irradiate magnesium aluminate spinel". United States. https://www.osti.gov/servlets/purl/750633.
@article{osti_750633,
title = {Electron channeling X-ray microanalysis for cation configuration in irradiate magnesium aluminate spinel},
author = {Matsumura, S. and Soeda, T. and Zaluzec, N. J. and Kinoshita, C.},
abstractNote = {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{center_dot}nAl{sub 2}O{sub 3} with n = 1.0 and 2.4. Most Al{sup 3+} lattice-ions occupy the octahedral (VIII) sites, while Mg{sup 2} lattice-ions reside on both the tetrahedral (IV) and the octahedral (VIII) sites. The structural vacancies are enriched in the IV-sites. Further evacuation of cations from the IV-sites to the VIII-sites is recognized in a disordering process induced by irradiation with 1 MeV Ne{sup +} ions up to 8.9 dpa at 870 K.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {12}
}

Conference:
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