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The Effects Of Substrate Thermal Mismatch on the Domain Structure of MOCVD-Derived Potassium Niobate Thin Films

Published online by Cambridge University Press:  15 February 2011

M. J. Nystrom  and
B. W. Wessels
M. J. Nystrom
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208
B. W. Wessels
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208
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Abstract

Domain stabilization in epitaxial potassium niobate films deposited by metalorganic chemical vapor deposition was studied. Stabilization was examined for films deposited on substrates with different coefficients of thermal expansion. X-ray diffraction of KNb03 films deposited on (100) MgAl204, (r) A1203, and (100)pseudocubic YAIO3 substrates shows a mixed domain structure consisting of (110) and (001) domains. However, KNb03 thin films deposited under identical conditions on (100) MgO, (100) SrTi03, and (100)pseudocubic LaA103 substrates exhibited only a single domain variant. A direct correlation between (001) domain volume fraction in the as-deposited KNb03 films and calculated strain resulting from thermal mismatch is observed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 474: Symposium L – Epitaxial Oxide Thin Films III , 1997 , 31
Copyright
Copyright © Materials Research Society 1997

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References

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