145617 20260217205531.0 doi 10.1021/acs.chemmater.4c02023 sideral 140546 ART-2024-140546 eng Varela-Domínguez, Noa Exploring topochemical oxidation reactions for reversible tuning of thermal conductivity in Perovskite Fe Oxides 2024 Access copy available to the general public Unrestricted We present a study on the reversibility of thermal conductivity in iron oxides through topochemical oxygen exchange between brownmillerite (BM) (Ca,Sr)FeO2.5 and perovskite (PV) (Ca,Sr)FeO3.0. 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 charge-transfer oxides toward amorphization and elucidate the origin of this effect. Conversely, the electrochemical injection of the O2– ions via a Y2O3:ZrO2 solid electrolyte reduces structural damage significantly, enhancing both reversibility and durability. This study underscores the importance of selecting appropriate topochemical oxygen exchange methods to maintain structural integrity and optimize functional performance in oxide-based tunable devices. info:eu-repo/grantAgreement/ES/AEI/PRE2020-096467 info:eu-repo/grantAgreement/ES/DGA/E13-20R info:eu-repo/grantAgreement/ES/MICINN-FEDER/PID2019-104150RB-I00 info:eu-repo/grantAgreement/ES/MICINN/PID2022-138883NB-I00 info:eu-repo/grantAgreement/EUR/MICINN/TED2021-130930B-I00 info:eu-repo/semantics/openAccess by https://creativecommons.org/licenses/by/4.0/deed.es 7.0 2024 MATERIALS SCIENCE, MULTIDISCIPLINARY 102 / 461 = 0.221 2024 Q1 T1 CHEMISTRY, PHYSICAL 45 / 185 = 0.243 2024 Q1 T1 2.065 2024 Chemical Engineering (miscellaneous) 2024 Q1 Materials Chemistry 2024 Q1 Chemistry (miscellaneous) 2024 Q1 12.0 2024 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Claro, Marcel S. Carbó-Argibay, Enrique Magén, César (orcid)0000-0002-6761-6171 Rivadulla, Francisco 36, 20 (2024), 10249-10258 Chem. mater. Chemistry of materials 0897-4756 3691057 http://zaguan.unizar.es/record/145617/files/texto_completo.pdf Versión publicada 3212493 http://zaguan.unizar.es/record/145617/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:145617 articulos driver 2026-02-17-20:32:23 ARTICLE