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Evaporation Spirals on {111} and {001} Surfaces of MgAl2O4 Spinel

Published online by Cambridge University Press:  02 July 2020

Svetlana V. Yanina  and
C. Barry Carter
Svetlana V. Yanina
Affiliation:
Department of Chemistry, 421 Washington Ave., SE, Minneapolis, MN55455-0132
C. Barry Carter
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave. SE, Minneapolis, MN55455-0132
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Extract

Processes at dislocation sites are frequently predominant mechanisms of surface evaporation or growth and thus determine resulting surface morphologies. Dislocation-induced evaporation patterns are also a convenient object for observation of dynamics of step motion on crystal surfaces, as such patterns have “fixed” origins, being pinned at the point of dislocation emergence. In the present work, observations of evaporation spirals formed on ﹛111﹜ and ﹛001﹜ surfaces of MgAl2O4 spinel are reported.

2x2x1 mm samples of single-crystal MgAl2O4 spinel of ﹛111﹜ and ﹛001﹜ orientation were annealed in a spinel crucible in vacuum (10-4—10-5 Torr) in a Centorr™ furnace at 1800°C for 8 hours. SPM images were collected in air in contact mode on a Nanoscope III (Digital Instruments, Santa Barbara, CA), using Si3N4 cantilevers (Ultralevers, Park Inst., Sunnyvale, CA) with a nominal spring constant of 0.12 N/m. Selected sample surfaces were examined for impurities by energy-dispersive X-ray spectroscopy (EDS) and X-ray photoemission spectroscopy (XPS).

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. 714 - 715
Copyright
Copyright © Microscopy Society of America

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References

References:

Bauser, I.E. and Strunk, H., Thin Solid Films, 93 (1982) 185.CrossRefGoogle Scholar
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This Research has been supported by the U. S. Department of Energy under Grant No DE-FG02-92ER45465. The SPM used is part of the Characterization Facility of the University of Minnesota. The authors thank Dr. Kurt Sickafus for providing the (11 l)-oriented MgAl2O4.Google Scholar