Structure, dielectric, ferroelectric, and optical properties of (1 − x)Ba(Zr0.2Ti0.8)O3 − x(Ba0.7Ca0.3)TiO3 thin films prepared by sol-gel method

► BZT-xBCT films with perovskite structure prepared by sol-gel method. ► High dielectric tunability and moderate dielectric constant for BZT-xBCT films. ► Band gap energy of about 3.90 eV for highly transparent BZT-xBCT films.