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Dielectric properties of BaTiO3/SrTiO3 multilayered thin films prepared by pulsed laser deposition

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4 Author(s)
Qu, B.D. ; Department of Physics and Astronomy, York University, North York, Ontario M3J 1P3, Canada ; Evstigneev, M. ; Johnson, D.J. ; Prince, R.H.

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BaTiO3/SrTiO3 multilayered thin films were deposited on Si and Pt/Si substrates. X-ray diffraction clearly shows the formation of the superstructures. Phase transition properties were studied via dielectric measurements. Glassy behavior, characterized by a strong frequency dispersion of dielectric properties, was found in samples with a total thickness of 400 nm, while in samples with a total thickness of 800 nm, normal ferroelectric phase transitions with two dielectric peaks were observed. A preliminary interpretation assumes that size effects which frustrate long range ferroelectric ordering may lead to the relaxational behavior in BaTiO3/SrTiO3 superstructures. © 1998 American Institute of Physics.

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Applied Physics Letters  (Volume:72 ,  Issue: 11 )