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Quantitative Study Of MgO (110) Surface Faceting Angles by AFM and SEM

Published online by Cambridge University Press:  02 July 2020

D. R. Giese ,
F. J. Lamelas ,
H. A. Owen  and
M. Gajdardziska-Josifovska
D. R. Giese
Affiliation:
Department of Physics, University of Wisconsin-Milwaukee, MilwaukeeWI53211
F. J. Lamelas
Affiliation:
Department of Physics, Marquette University, MilwaukeeWI53233
H. A. Owen
Affiliation:
Department of Biological Sciences, University of Wisconsin-Milwaukee, Milwaukee, WI53211
M. Gajdardziska-Josifovska
Affiliation:
Department of Physics, University of Wisconsin-Milwaukee, MilwaukeeWI53211
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Extract

The stability of polar and neutral MgO surfaces has been addressed by theory and experiment as an ideal example of ionic oxides with rock-salt structure, but with unresolved controversial results. For example, energy-minimization theory predicted that higher energy polar MgO (111) and neutral MgO (110) surfaces could thermally facet into the lowest energy MgO (100) planes. Early low-energy electron diffraction (LEED) experiments reported diffraction spot splitting, interpreted as evidence for thermal faceting to ﹛100﹜ planes. However, a recent study found MgO (111) faceting was caused by chemical etching with nitric or phosphoric acid, and not promoted by annealing. Quantitative atomic force microscopy (AFM) and scanning electron microscopy (SEM) measurement of the facet angles revealed them to be vicinal planes rather than the predicted ﹛100﹜ planes. A recent AFM study reported thermal faceting of MgO (110) into vicinal planes.

Type
Scanned Probe Microscopy
Information
Microscopy and Microanalysis , Volume 6 , Issue S2: Proceedings: Microscopy & Microanalysis 2000, Microscopy Society of America 58th Annual Meeting, Microbeam Analysis Society 34th Annual Meeting, Microscopical Society of Canada/Societe de Microscopie de Canada 27th Annual Meeting, Philadelphia, Pennsylvania August 13-17, 2000 , August 2000 , pp. 708 - 709
Copyright
Copyright © Microscopy Society of America

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References

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