TITLE

Enhanced in-plane ferroelectricity in Ba0.7Sr0.3TiO3 thin films grown on MgO (001) single-crystal substrate

AUTHOR(S)
Wang, D. Y.; Wang, Y.; Zhou, X. Y.; Chan, H. L. W.; Choy, C. L.
PUB. DATE
May 2005
SOURCE
Applied Physics Letters;5/23/2005, Vol. 86 Issue 21, p212904
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Highly oriented Ba0.7Sr0.3TiO3 thin films were grown on MgO (001) single-crystal substrate using pulsed-laser deposition and the in-plane ferroelectric properties of the film were evaluated. X-ray diffraction characterization revealed a good crystallinity and tensile in-plane stress in the film. A well-defined ferroelectric hysteresis loop with Pr=9.5 μC/cm2 was observed along the (100) direction, which implied an enhanced in-plane ferroelectricity in the Ba0.7Sr0.3TiO3 thin film in comparison with the Ba0.7Sr0.3TiO3 ceramics. Curie temperature of the film was found to be ∼88 °C, which is nearly 50 °C higher than that of the Ba0.7Sr0.3TiO3 ceramics. The butterfly-shaped C-V characteristic curve also evidenced the enhanced in-plane ferroelectric property in the film, and a large dielectric tunability of 69% was found at 1 MHz under a moderate dc bias field. The observation of enhanced ferroelectricity along the in-plane direction in the highly oriented Ba0.7Sr0.3TiO3 thin film was explained in terms of the increased tetragonality (a/c=1.016) induced by the lattice misfit strain.
ACCESSION #
17226911

 

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