Exploring Topochemical Oxidation Reactions for Reversible Tuning of Thermal Conductivity in Perovskite Fe Oxides.

ABSTRACT: We present a study on the reversibility of thermal conductivity in iron oxides through topochemical oxygen exchange between brownmillerite (BM) (Ca,Sr)FeO_2.5 and perovskite (PV) (Ca,Sr)FeO_3.0. By using different oxidation methods, including gas phase (O₂/O₃), liquid phase (NaOCl in H₂O), and solid electrolyte (Y₂O₃:ZrO₂), we demonstrate that the oxidation pathway has a critical influence on the reversibility of the ionic-exchange process. Cyclic oxidation and reduction using O₂/O₃ or NaOCl lead to an important accumulation of structural defects, undermining the reversibility of thermal conductivity. In the case of wet oxidation, we demonstrate an inherent tendency of negative charg

SUBMITTER: Varela-Dominguez N 

PROVIDER: S-EPMC11500631 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature