Microstructure and dielectric properties of nanostructured barium titanate free-standing films

Abstract

We report on dielectric properties of nanostructured barium titanate free-standing films with an average grain size from 57nm to 1600nm prepared at the liquid surface by sol-gel method using high concentration Ba-Ti alkoxide precursor solutions. Free-standing films with a coarse grain showed a normal ferroelectric behavior. Free-standing film with a grain size of 57nm, however, showed unusual frequency dependence of dielectric response and polarization reversal characteristics.