Enhanced energy storage density in Sc~(3+) substituted Pb(Zr_(0.53)Ti_(0.47))O_3 nanoscale films by pulse laser deposition technique

摘要

Highly oriented Pb(Zr0.53Ti0.47)(0.90)Sc0.10O3 (PZTS) thin films were deposited on La0.67Sr0.33MnO3 (LSMO) buffer layer coated on MgO (100) substrates by following two subsequent laser ablation processes in oxygen atmosphere employing pulse laser deposition technique. The PZTS films were found to grow in tetragonal phase with orientation along (100) plane as inferred from x-ray diffractometry analysis. The structural sensitive symmetric E (LO2) Raman band softened at elevated temperature along with its intensity continuously decreased until it disappeared in the cubic phase above 350 K. The existence of broad Raman bands at high temperature ( 350 K) is attributed to the symmetry forbidden Raman scattering in relaxor cubic phase due to symmetry breaking in nano length scale. The temperature dependent dielectric measurements were performed on metal-ferroelectricmetal capacitors in the frequencies range of 10(2)-10(6) Hz was observed to be diffused over a wide range of temperature 300-650 K and exhibits high dielectric constant similar to 5700 at room temperature. An excellent high energy storage density (U-re) similar to 54 J/cm(3) with efficiency similar to 70% was estimated at applied voltage 1.82 MV/cm. High DC breakdown strength, larger dielectric constant and high restored energy density values of our PZTS thin films indicate its usage in high energy storage applications.