Size effects in barium titanate thin film heterostructures withconductive oxide electrodes
Maria, J.-P.; Trolier-McKinstry, S.; Schlom, D.G.
Applications of Ferroelectrics, 1996. ISAF apos;96., Proceedings of the Tenth IEEE International Symposium on
Volume 1, Issue , 18-21 Aug 1996 Page(s):333 - 336 vol.1
Digital Object Identifier 10.1109/ISAF.1996.602761
Summary:Thin film, small particle, and fine grained materials have long
been known to behave differently from their bulk counterparts, and as
such, these differences have been termed size effects. The origins of
size effects, though well known for some materials, in ferroelectrics
are largely misunderstood. Currently inhibiting the application of
ferroelectrics, these effects become commercially important in devices
such as MEMs, MLCs and DRAMs. Included in such structures are
ferroelectric layers with thicknesses or grains approaching the critical
size below which ferroelectric properties degrade. Expitaxial
BaTiO3 thin film heterostructures utilizing conductive oxide
electrodes have been deposited by PLD, while 4-circle X-ray diffraction,
electrical property measurements, and RBS have been applied to
characterize the films. The Curie temperatures for BaTiO3
films were found to be depressed by as much as 150°C, with the
magnitude of this depression believed to be dependent upon the coherent
crystal size of the films
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