Enhanced Oxide Ion Diffusion by Lanthanum Substitution in the Palmierite Sr_3-3<i>x</i> La_2<i>x</i> V₂O₈ via Increased Tetrahedral Distortion and Cation Vacancies.

ABSTRACT: Promising ionic conductivity has previously been reported in the palmierite oxide Sr₃V₂O₈. Oxide-ion diffusion within this system occurs via the "cog-wheel" mechanism where rotation of VO₄ and oxygen deficient VO₃ units result in the formation of V₂O₇ dimers which continuously break and reform. During this process an oxide ion from a VO₄ tetrahedra can move to the vacant site of the VO₃ group, facilitating the movement of oxide-ions throughout the structure. Here, we report the electrical and structural properties of the series Sr_3-3x La_2x V₂O₈ (x = 0.00-0.25). Combined neutron diffraction and atomistic simulations reveal that s

SUBMITTER: Watson V 

PROVIDER: S-EPMC12529909 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature