Monoclinic distortion, polarization rotation and piezoelectricity in the ferroelectric Na_0.5Bi_0.5TiO₃.

ABSTRACT: The relationship between crystal structure and physical properties in the ferroelectric Na_0.5Bi_0.5TiO₃ (NBT) has been of interest for the last two decades. Originally, the average structure was held to be of rhombohedral (R3c) symmetry with a fixed polarization direction. This has undergone a series of revisions, however, based on high-resolution X-ray diffraction, total neutron scattering, and optical and electron microscopy. The recent experimental findings suggest that the true average symmetry is monoclinic (space group Cc), which allows for a rotatable spontaneous polarization. Neither polarization rotation nor its potentially important real role in enhanced piezoelectricity is well understood. The present work describes an in s

SUBMITTER: Choe H 

PROVIDER: S-EPMC6038949 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature