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.
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Goh, G.K.L., Levi, C.G. & Lange, F.F. Hydrothermal epitaxy of KtaO3 thin films. Journal of Materials Research 17, 2852–2858 (2002). https://doi.org/10.1557/JMR.2002.0414
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DOI: https://doi.org/10.1557/JMR.2002.0414