Enhanced Oxide Ion Conductivity by Ta Doping of Ba₃Nb_1-xTa_xMoO_8.5.

ABSTRACT: Significant oxide ion conductivity has previously been reported for the Ba₃M'M″O_8.5 family (M' = Nb⁵⁺, V⁵⁺; M″ = Mo⁶⁺, W⁶⁺) of cation-deficient hexagonal perovskite derivatives. These systems exhibit considerable structural disorder and competitive occupation of two distinct oxygen positions (O3 site and O2 site), enabling two-dimensional (2D) ionic conductivity within the ab plane of the structure; higher occupation of the tetrahedral O3 site vs the octahedral O2 site is known to be a major factor that promotes oxide ion conductivity. Previous chemical doping studies have shown that substitution of small amounts of the M' or M″ ions can result in significant changes to both the structure and ionic conductivity. Here,

SUBMITTER: Sherwood B 

PROVIDER: S-EPMC9890478 | biostudies-literature | 2023 Jan

REPOSITORIES: biostudies-literature