Hostname: page-component-586b7cd67f-rdxmf Total loading time: 0 Render date: 2024-11-26T10:30:39.079Z Has data issue: false hasContentIssue false

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

Published online by Cambridge University Press:  02 July 2020

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
Get access

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
Copyright
Copyright © Microscopy Society of America

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

References:

Bauser, I.E. and Strunk, H., Thin Solid Films, 93 (1982) 185.CrossRefGoogle Scholar
2.Hirth, J.P. and Pound, G.M., J. Chem. Phys., 26 (1957) 1216.CrossRefGoogle Scholar
3.Hirth, J.P. and Lothe, L., Theory of Dislocations. Krieger Publishing. (1992).Google Scholar
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