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Epitaxial Growth and Structure of Highly Mismatched Oxide Films with Rock-salt Structure on MgO

Published online by Cambridge University Press:  10 February 2011

P. A. Langjahr ,
T. Wagner ,
F. F. Lange  and
M. Ruole
P. A. Langjahr
Affiliation:
Max-Planck-Institut f'ir Metallforschung, 70174 Stuttgart, Germany
T. Wagner
Affiliation:
Max-Planck-Institut f'ir Metallforschung, 70174 Stuttgart, Germany
F. F. Lange
Affiliation:
Materials Department, College of Engineering, University of California, Santa Barbara, Ca 93106, USA
M. Ruole
Affiliation:
Max-Planck-Institut f'ir Metallforschung, 70174 Stuttgart, Germany
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Abstract

CaO thin films were grown on (001) MgO single crystal substrates by a chemical solution deposition method to study the influence of a relatively high lattice mismatch (14%) on the epitaxial growth. In order to minimize an influence of a different crystal structure and chemistry between film and substrate, film and substrate were chosen to have the same structure (NaCl) and a similar chemistry. The films were heat treated until they broke up into single crystal islands on the MgO substrate. X-ray pole figure analysis and TEM observations of the CaO-films showed that most of the grains had a single out-of-plane orientation (111)CaO || (001)MgO, corresponding to two non-redundant, symmetry related in-plane variants [1 10](111)CaO || [110](001)MgO and [110](111)CaO || [110](001)MgO. A near coincidence site lattice (NCSL) model could be constructed for the interface, suggesting good lattice and charge matching for the observed orientation relations. The mechanisms and energetics leading to the experimentally observed orientation relations are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 441: Thin Films – Structure and Morphology , 1996 , 193
Copyright
Copyright © Materials Research Society 1997

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