Achieving High Piezoelectric Performance across a Wide Composition Range in Tetragonal (Bi,Na)TiO-BaTiO Films for Micro-electromechanical Systems.

Tetragonal (1-)(Bi,Na)TiO-BaTiO films exhibit enhanced piezoelectric properties due to domain switching over a wide composition range. These properties were observed over a significantly wider composition range than the morphotropic phase boundary (MPB), which typically has a limited composition range of 1-2%. The polarization axis was found to be along the in-plane direction for the tetragonal composition range = 0.

Preferential growth of (001)-oriented BiSiO thin films deposited on (101)-oriented rutile substrates and their ferroelectric and dielectric properties.

Ferroelectric thin films are important because of their great potential for use in various electric devices such as ferroelectric random-access memory. It was expected that BiSiO, a Si-containing ferroelectric material, would show improved ferroelectricity by targeting a film with the (001)-orientation (polar-axis) on the substrate. Although there was a narrow process window for the deposition of the (010)/(001)-oriented BiSiO thin film, it was successfully prepared on a (101)-oriented TiO single substrate using the pulsed layer deposition technique.

Large Piezoelectric Response in Lead-Free (BiNa)TiO-Based Perovskite Thin Films by Ferroelastic Domain Switching: Beyond the Morphotropic Phase Boundary Paradigm.

Strong electromechanical coupling is observed in tetragonal Pb-free 0.7(BiNa)TiO-0.3BaTiO films, which is far from the morphotropic phase boundary, prepared by pulsed laser deposition on a Si substrate.