Abstract
Solid solutions of (Sr1-xCax)Bi2Ta2O9 layered compounds with composition x = 0,0.2, 0.4,0.6.0.8 and 1.0 were synthesized by conventional powder processing route. Phase formation and structural evaluation of both calcined powders and sintered pellets were investigated using x-ray diffraction and micro-Raman spectroscopy. The decrease of in-plane lattice parameter a from 5.502 to 5.420 Å confirms the substitution of Sr by Ca with smaller ionic radii. The increase of orthorhombic distortion (b/a) with Ca content in SrBi2Ta2O9 compound is attributed to the increase of lattice mismatch between TaO2 and SrO planes in the perovskite unitcell of SrTa2O7. The increase in the lowest Raman modes at 28.7 cm−1 and 60.2 cm−1 with mole fraction of Ca established that the lower mass of Ca is indicative of increasing the phase transition temperature (Tc) in comparison with Tc of SrBi2Ta209. The remanent polarization and dielectric constant of SBT sample is decreased with Ca substitution at Sr-site.
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