Topotaxial Formation of Mg4Nb2O9 and MgNb2O6 Thin Films on MgO (001) Single Crystals by Vapor–Solid Reaction |
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| Authors: | Duochun Sun Stephan Senz Dietrich Hesse |
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| Affiliation: | Max Planck Institute of Microstructure Physics, D-06120 Halle (Saale), Germany |
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| Abstract: | Thin-film solid-state reactions in the system MgO–Nb2O5 are experimentally investigated. MgO (001) substrates are subjected to Nb-O vapor at different temperatures in high vacuum. Thin films containing the phases Mg4Nb2O9 and MgNb2O6 are formed by a vapor–solid reaction between the Nb-O vapor and the substrate. The crystallographic orientations of these phases are studied by X-ray diffractometry including pole figure analysis. Mg4Nb2O9 grows (11.4)-, (11.6)-, and (11.9)-oriented, whereas MgNb2O6 grows with a preferential (241) orientation. The crystallographic relationships and their origins are discussed. |
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| Keywords: | formation thin films single crystals |
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