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Abstract
Bismuth layered perovskites of composition Sr1-xCaxBi2Ta2O9 (SCBT) with x=0, 0.1, 0.2, and 0.3 were grown using pulsed laser deposition technique. Influence of Ca on the structural and ferroelectric properties of SrBi2Ta2O9 (SBT) thin films have been investigated. XRD analysis revealed that SCBT thin films were polycrystalline after annealing at 750°C. The decrease in lattice parameter with increasing Ca contents in SBT thin films was attributed to smaller ionic radii of Ca at Sr-site. The grain size and the surface roughness were increased with higher Ca concentration as observed by atomic force microscopy. SBT thin films with 20% Ca doping exhibited enhanced ferroelectric properties with a remanent polarization (Pr) of 23.8 µC/cm2. The fatigue resistance of Pr in SBT thin films degraded upon Ca incorporation at Sr-site. The coercive field increased with increases in Ca contents in SBT. The dielectric constant of SBT thin films was increased with the increase in grain size. The leakage current density of the SCBT thin films increased upon Ca incorporation.
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