Local Structure in α-BIMEVOXes (ME = Ge, Sn).

ABSTRACT: The BIMEVOXes are among the best oxide ion conductors at low and intermediate temperatures. Their high conductivity is associated with local defect structure. In this work, the local structures of two BIMEVOX compositions, Bi₂V_0.9Ge_0.1O_5.45 and Bi₂V_0.95Sn_0.05O_5.475, are examined using total neutron and X-ray scattering methods, with both compositions exhibiting the ordered α-phase at 25 °C and the disordered γ-phase at 700 °C. While the diffraction data for the α-phase do not allow for the polar (C2) and nonpolar (C2/m) structures to be readily distinguished, measurements of dielectric permittivity suggest the α-phase is weakly ferroelectric in character, consistent with calculation

SUBMITTER: Yue Y 

PROVIDER: S-EPMC9835824 | biostudies-literature | 2023 Jan

REPOSITORIES: biostudies-literature