Dislocations Accelerate Oxygen Ion Diffusion in La_0.8Sr_0.2MnO₃ Epitaxial Thin Films.

ABSTRACT: Revealing whether dislocations accelerate oxygen ion transport is important for providing abilities in tuning the ionic conductivity of ceramic materials. In this study, we report how dislocations affect oxygen ion diffusion in Sr-doped LaMnO₃ (LSM), a model perovskite oxide that serves in energy conversion technologies. LSM epitaxial thin films with thicknesses ranging from 10 nm to more than 100 nm were prepared by pulsed laser deposition on single-crystal LaAlO₃ and SrTiO₃ substrates. The lattice mismatch between the film and substrates induces compressive or tensile in-plane strain in the LSM layers. This lattice strain is partially reduced by dislocations, especially in the LSM films on LaAlO₃. Oxygen isotope exchange measured by secondary i

SUBMITTER: Navickas E 

PROVIDER: S-EPMC5707630 | biostudies-literature | 2017 Nov

REPOSITORIES: biostudies-literature