High tunability of lead strontium titanate thin films using a conductive LaNi O3 as electrodes

Highly tunable films of dielectric Pbx Sr1-x Ti O3 (with x=0.3 and 0.4) have been deposited on conductive LaNi O3 coated LaAl O3 substrates using a sol-gel technique. The processing condition was found to greatly influence the microstructure as well as the dielectric and electrical properties of the films. At room temperature, dielectric tunability values as high as 70% and 78.6% at an applied electric field of 223 kVcm were achieved for the Pb0.3 Sr0.7 Ti O3 and Pb0.4 Sr0.6 Ti O3 films, respectively.