The high-pressure structure of (1-x)Na 0.5 Bi 0.5 TiO 3 -xBaTiO 3 at the morphotropic phase boundary.

ABSTRACT: The pressure-induced structural changes in the perovskite-type (ABO 3 ) ferroelectric solid solution (1-x)Na 0.5 Bi 0.5 TiO 3 -xBaTiO 3 (NBT-xBT) at the morphotropic phase boundary (MPB) ( xMPB=0.048 ) have been analyzed up to 12.3 GPa by single-crystal x-ray diffraction with synchrotron radiation. A pressure-induced phase transition takes place between 4.4 and 5.0 GPa, where the pseudocubic low-pressure phase transforms into an orthorhombic high-pressure phase with space group Pnma. The high-pressure phase is comprised of mixed BO 6 tilts and anti-polar A-cation displacements, without exhibiting coherent off-centered shifts of the B-site Ti 4+ cations that can be detected by synchrotron x-ray diffraction. Our results reveal that at ambient pressure and room temperature the NBT- xMPB BT st

SUBMITTER: Rosche C 

PROVIDER: S-EPMC11322305 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature