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Models of Magnesium Oxide (111) Surface Reconstructions Obtained from Direct Phasing of Transmission Electron Diffraction Data

Published online by Cambridge University Press:  02 July 2020

R. Plass ,
K. Egan ,
C. Collazo-Davila ,
D. Grozea ,
E. Landree ,
L. D. Marks  and
M. Gajdardziska-Josifovska
R. Plass
Affiliation:
Department of Physics, University of Wisconsin at Milwaukee, Milwaukee, WI53211
K. Egan
Affiliation:
Department of Physics, University of Wisconsin at Milwaukee, Milwaukee, WI53211
C. Collazo-Davila
Affiliation:
Department of Mat. Science and Eng., Northwestern University, Evanston, IL, 60208
D. Grozea
Affiliation:
Department of Mat. Science and Eng., Northwestern University, Evanston, IL, 60208
E. Landree
Affiliation:
Department of Mat. Science and Eng., Northwestern University, Evanston, IL, 60208
L. D. Marks
Affiliation:
Department of Mat. Science and Eng., Northwestern University, Evanston, IL, 60208
M. Gajdardziska-Josifovska
Affiliation:
Department of Physics, University of Wisconsin at Milwaukee, Milwaukee, WI53211
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It has long been thought that (111) surfaces of rock salt oxides microfacet to neutral surfaces upon annealing because of the very large energies involved in bulk terminating a layer of like ions. However in a recent reflection electron microscopy (REM) study Gajdardziska-Josifovska et al. found that MgO(lll) surfaces annealed in flowing oxygen furnaces at 1500°C not only did not microfacet, but displayed a √3×√3R30° surface periodicity that was stable in air. To determine the structure of this unusually stable surface MgO (111) transmission electron microscopy (TEM) samples were annealed in a vacuum furnace in the present study and their transmission electron diffraction (TED) patterns were analyzed with direct phasing methods.

The TEM samples were prepared by orienting a MgO single crystal and sawing lmm wafers along a (111) plane. Disk samples were then ultrasonically drilled, dimpled, mechanically polished and/or hot nitric acid etched, and milled with 5 KeV Ar+ ions.

Type
Electron Crystallography; the Electron Phase Problem
Information
Microscopy and Microanalysis , Volume 3 , Issue S2: Proceedings: Microscopy & Microanalysis '97, Microscopy Society of America 55th Annual Meeting, Microbeam Analysis Society 31st Annual Meeting, Histochemical Society 48th Annual Meeting, Cleveland, Ohio, August 10-14, 1997 , August 1997 , pp. 1039 - 1040
Copyright
Copyright © Microscopy Society of America 1997

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References

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