Phase stabilization of δ-Bi2O3 nanostructures by epitaxial growth onto single crystal SrTiO3 or DyScO3 substrates

Proffit, D. L.; Bai, G.-R.; Fong, D. D.; Fister, T. T.; Hruszkewycz, S. O.; Highland, M. J.; Baldo, P. M.; Fuoss, P. H.; Mason, T. O.; Eastman, J. A.
January 2010
Applied Physics Letters;1/11/2010, Vol. 96 Issue 2, p021905
Academic Journal
We observe that the high-temperature δ-phase of Bi2O3 is stabilized to room temperature by the epitaxial growth of nanostructures onto either (001)-oriented SrTiO3 or (001)p-oriented DyScO3 single crystal substrates. In addition, the morphology can be controlled by the miscut of the substrate. Synchrotron x-ray scattering observations at controlled temperatures and oxygen partial pressures reveal that the δ-Bi2O3 nanostructures are coherently strained to the substrates at room temperature. Annealing the nanostructures at 600 °C causes gradual conversion of the (001)-oriented δ-phase to an unidentified strain-relaxed phase.


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