Origin of Polarization in Bismuth Sodium Titanate-Based Ceramics.

ABSTRACT: The classical view of the structural changes that occur at the ferroelectric transition in perovskite-structured systems, such as BaTiO₃, is that polarization occurs due to the off-center displacement of the B-site cations. Here, we show that in the bismuth sodium titanate (BNT)-based composition 0.2(Ba_0.4Sr_0.6TiO₃)-0.8(Bi_0.5Na_0.5TiO₃), this model does not accurately describe the structural situation. Such BNT-based systems are of interest as lead-free alternatives to currently used materials in a variety of piezo-/ferroelectric applications. A combination of high-resolution powder neutron diffraction, impedance spectroscopy, and ab initio calculations reveals that Ti⁴⁺ contributes less than a third in

SUBMITTER: Zhang H 

PROVIDER: S-EPMC10910510 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature