Ferroelectric PbTiO3 thin films have been prepared by a low-pressure MOCVD process. Epitaxial films with a crystal structure of a bulk equilibrium tetragonal phase were readily obtained within a range of growth conditions. However, by providing excess Pb in the growth process, we have observed an epitaxy-induced phase for near-stoichiometry PbTiO3 which possesses a perovskite-like, but possible, orthorhombic structure.
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Bai et al. (1992) studied this question.
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