Site definition and characterization of La-substituted Bi4Ti3O12 thin films prepared by metalorganic chemical vapor deposition
作者： Takayuki Watanabe , Hiroshi Funakubo , Manabu Mizuhira , Minoru Osada
DOI: 10.1063/1.1417988
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摘要: The effects of La content on crystal structure and ferroelectric property La-substituted Bi4−xLaxTi3O12 were investigated. We utilized as-deposited thin films prepared (111)Pt/SiO2/Si substrates at 680 °C by metalorganic chemical vapor deposition. showed (117) preferred orientation, the lattice spacing plane increased with increasing content. With aid Raman spectroscopy, we found a pronounced site selectivity ions for Bi (A site) in pseudoperovskite layer. Even small (x=0.2), an incorporation ion into layer greatly enhanced both remanent polarization coercive field, but improved properties almost irrespective x>0.2. For (Bi3.27La0.73)Ti3O12 film, confirmed good fatigue endurance up to 2×1010 switching cycles.
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