Dynamics of anisotropic oxygen-ion migration in strained cobaltites
arXiv:2111.10565 · doi:10.1021/acs.nanolett.1c04057
Abstract
Orientation control of oxygen vacancy channel (OVC) is a highly desirable for tailoring oxygen diffusion as it serves fast transport channel in ion conductors, which is widespread exploited in solid-state fuel cells, catalysts, and ion-batteries. Direct observation of oxygen-ions hopping towards preferential vacant sites is a key to clarifying migration pathways. Here we report the anisotropic oxygen-ion migration mediated by strain in ultrathin cobaltites via in-situ thermal activation in an atomic-resolved transmission electron microscopy. Oxygen migration pathways are constructed on the basis of the atomic structure during the OVC switching, which is manifested as the vertical-to-horizontal OVC switching under tensile strain, but the horizontal-to-diagonal switching under compression. We evaluate the topotactic structural changes to OVC, determine the crucial role of tolerance factor for OVC stability and establish the strain-dependent phase diagram. Our work provides a practical guide for engineering OVC orientation that is applicable ionic-oxide electronics.
References in corpus (13)
- Reversible redox reactions in an epitaxially stabilized SrCoOx oxygen sponge
- Strain controlled oxygen vacancy formation and ordering in CaMnO
- Topotactic phase transformation of the brownmillerite SrCoO2.5 to the perovskite SrCoO3-δ
- Strain Control of Oxygen Vacancies in Epitaxial Strontium Cobaltite Films
- Strain-Induced Spin States in Atomically Ordered Cobaltites
- Orienting oxygen vacancies for fast catalytic reaction
- Factors controlling oxygen migration barriers in perovskites
- Oxygen diffusion pathways in brownmillerite SrCoO2.5: Influence of structure and chemical potential
- Coupling and competition between ferroelectricity, magnetism, strain and oxygen vacancies in AMnO3 perovskites
- Near-Room Temperature Ferromagnetic Insulating State in Highly Distorted LaCoO2.5 with CoO5 Square Pyramids
- Exploiting symmetry-mismatch to control magnetism in a ferroelastic heterostructure
- Macroscopic visualization of fast electrochemical reaction of SrCoOx oxygen sponge
- Giant photoinduced lattice distortion in oxygen-vacancy ordered SrCoO2.5 thin films