Uncovering ferroelectric polarization in tetragonal (Bi_1/2K_1/2)TiO₃-(Bi_1/2Na_1/2)TiO₃ single crystals.

ABSTRACT: We report the robust ferroelectric properties of (1 - x)(Bi_1/2Na_1/2)TiO₃-x(Bi_1/2K_1/2)TiO₃ (x = 33%) single crystals grown by a top-seeded solution growth process under a high oxygen-pressure (0.9 MPa) atmosphere. The sample exhibit a large remanent polarization of 48 μC/cm² and a sizeable piezoelectric strain constant of 460 pm/V. Neutron powder diffraction structural analysis combined with first-principles calculations reveals that the large ferroelectric polarization comparable to PbTiO₃ stems from the hybridization between Bi-6p and O-2p orbitals at a moderately negative chemical pressure.

SUBMITTER: Kitanaka Y 

PROVIDER: S-EPMC6917808 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature