Optical and Electric Properties of Bi_0.5Na_0.5TiO₃-Based Thin Films Grown on Indium–Tin-Oxide-Coated Glass Substrates

Abstract

0.85(0.94Bi0.5Na0.5TiO3–0.06BaTiO3)–0.15K0.5Na0.5NbO3 thin films have been prepared on indium–tin-oxide-coated glass substrates by pulsed laser deposition. Both X-ray diffraction and transmission electron microscopy reveal that the films have tetragonal crystal structure with columnar-like grains. The films show excellent optical transmittance of 90% and the band gap is calculated to be 3.61 eV. The slim polarization-electron filed hysteresis loop indicates the weak ferroelectricity, which is consistent with the capacitor-electric field curves. These results may be helpful for searching transparent ferroelectric materials.