Structural, dielectric and ferroelectric properties of (Bi,Na)TiO3-BaTiO3 system studied by high throughput screening

Thin-filmmaterials libraries of the Bi2O3-Na2O-TiO2-BaO systemin a broad composition range have been deposited in ultra-high vacuum from elemental evaporation sources and an oxygen plasma source. A high throughput approach was used for systematic compositional and structural characterization and the screening of the dielectric and ferroelectric properties. The perovskite (Bi,Na) TiO3-BaTiO3 phase with a Ba concentration near the morphotropic phase boundary (ca. 6 at.%) exhibited a relative dielectric permittivity of 180, a loss tangent of 0.04 and remnant polarization of 19 mu C/cm(2). Compared to published data, observed remnant polarization is close to that known for epitaxially grown films but higher than the values reported for polycrystalline films. The high throughput methodology and systematic nature of the study allowed us to establish the composition boundaries of the phase with optimal dielectric and ferroelectric characteristics. (C) 2016 Elsevier B.V. All rights reserved.