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Surfaces of Gadolinium Gallium Garnet

Published online by Cambridge University Press:  02 July 2020

S. R. Gilliss ,
S. V. Yanina ,
N. Ravishankar  and
C. B. Carter
S. R. Gilliss
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave. SE, Minneapolis, MN55455
S. V. Yanina
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave. SE, Minneapolis, MN55455
N. Ravishankar
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave. SE, Minneapolis, MN55455
C. B. Carter
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave. SE, Minneapolis, MN55455
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Extract

Sintering and many problems in adsorption and catalysis require an understanding of the surface structures of crystals, which have been subjected to various types of heat treatment. For example, heat treatment of m-plane sapphire surfaces can cause a transformation from a flat vicinal surface into those of a faceted hill-and-valley structure. Many technologically interesting materials form with the garnet structure, including YIG, YAG, GGG and many silicates. However, there has been relatively little discussion of the structure and behavior of such surfaces. This paper illustrates the use of visible-light microscopy (VLM), atomic-force microscopy (AFM) and scanning electron microscopy (SEM) for studying the ﹛111﹜ surface of gadolinium gallium garnet (GGG or Gd3Ga5O12).

2x2x1 mm samples of monocrystalline GGG with ﹛111﹜ surface orientation were heat treated in air at 1575°C for 24 hours in order to study the processes a surface undertakes while reaching its equilibrium state.

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. 716 - 717
Copyright
Copyright © Microscopy Society of America

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References

References:

1.Heffelfinger, J.R., Bench, M.W. and Carter, C.B., “On the Faceting of Ceramic Surfaces,” Surf. Sci. 343(1995): LI 161-LI 166.CrossRefGoogle Scholar
2.Glass, H.L., P.J.B., and T.N. Hamilton, , “Substrate Facet Replication by Epitaxial Magnetic Garnet Films,” Materials Science Bulletin 8(1973): 309–318.Google Scholar
3. This research has been supported by the 3M Heltzer Chair. SVY and NR acknowledge support from the U.S. Department of Energy through Grant DE-FG02-92ER45465-A004. The authors would like to thank Prof. Stan Erlandsen for access to the Hitachi S-900 and Chris Frethem for technical assistance.Google Scholar