Oxide Ion Conductivity, Proton Conductivity, and Phase Transitions in Perovskite-Derived Ba_3-x Sr _x YGa₂O_7.5 0 ≤ x ≤ 3 Materials.

ABSTRACT: We report the synthesis, structural characterization, and oxide ion and proton conductivities of the perovskite-related Ba_3-x Sr _x YGa₂O_7.5 family. Single-phase samples are prepared for 0 ≤ x ≤ 3 and show a complex structural evolution from P2/c to C2 space groups with an increase in x. For 1.0 ≲ x ≲ 2.4, average structures determined by X-ray and neutron powder diffraction show metrically orthorhombic unit cells, but HAADF-STEM imaging reveals this is caused by microstructural effects due to intergrowths of the Ba- and Sr-rich structure types. Variable-temperature powder diffraction studies suggest that 0 ≲ x ≲ 2.4 compositions undergo a phase transition upon being heated to space gr

SUBMITTER: Fuller CA 

PROVIDER: S-EPMC9086979 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature