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Electron Microscopy Characterization Of Epitaxial Growth Of Ag Deposited On Mgo Microcubes

Published online by Cambridge University Press:  15 February 2011

J. Liu ,
M. Pan  and
G. E. Spinnler
J. Liu
Affiliation:
Center for Solid State Science, Arizona State University, Tempe, AZ 85287, USA
M. Pan
Affiliation:
Center for Solid State Science, Arizona State University, Tempe, AZ 85287, USA
G. E. Spinnler
Affiliation:
Shell Development Company, Westhollow Research Center, P. O. Box 1380 Houston, TX 72871, USA
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Abstract

The crystalline structure, the morphology and the chemistry of small Ag particles vacuum-deposited on preheated MgO microcubes were characterized by in situ and ex situ electron microscopy and surface analysis techniques. Observations were made of the nucleation and growth of Ag clusters on MgO surfaces and along surface steps. It is found that Ag particles deposited onto clean MgO crystals have an epitaxial orientation relationship of (100)Agll(100)MgO with [100]Agll[00]MgO. Prior to air exposure Ag particles are stable under the electron beam but they become unstable upon exposure to air. During electron irradiation on air-exposed samples terraces are formed on the surfaces of MgO cubes, preferentially near Ag particles and at their interfaces with the substrate. The stability of vacuum-deposited Ag particles and the growth of the terraces on MgO microcubes seem to depend on air exposure of the sample.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 295: Symposium W – Atomic-Scale Imaging of Surfaces and Interfaces , 1992 , 127
Copyright
Copyright © Materials Research Society 1993

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