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Hydrothermal epitaxy of KtaO3 thin films

Published online by Cambridge University Press:  31 January 2011

Gregory K. L. Goh ,
Carlos G. Levi  and
Fred F. Lange
Gregory K. L. Goh*
Affiliation:
Materials Department and Materials Research Laboratory, University of California, Santa Barbara, California 93106
Carlos G. Levi
Affiliation:
Materials Department and Materials Research Laboratory, University of California, Santa Barbara, California 93106
Fred F. Lange
Affiliation:
Materials Department and Materials Research Laboratory, University of California, Santa Barbara, California 93106
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Heteroepitaxial KTaO3 thin films were synthesized by the hydrothermal method below 175 °C in highly alkaline aqueous KOH solutions. KTaO3 films synthesized in 7 M KOH solutions contained a defect pyrochlore phase that had (400) and (111) out-of-plane orientations. The (400) oriented pyrochlore islands were epitaxially related to the (100) SrTiO3 substrate while the (111) oriented pyrochlore islands had four in-plane variants. Pyrochlore-free KTaO3 films could be synthesized in a 15 M KOH solution. Pyrochlore-free films were also grown at 7 M KOH by delaying the introduction of the (100) SrTiO3 substrate into the synthesis solution until the conditions favoring the formation of the pyrochlore phase had dissipated.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 11 , November 2002 , pp. 2852 - 2858
Copyright
Copyright © Materials Research Society 2002

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References

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