Abstract
Chemical modification has been proved to be an effective way to tune various material properties. Herein, the oxygen intake/release properties of substituted Sr\( _{1-x} \)M\( _{x} \)CoO\( _{2.5} \) (M = Ca, Ba, x = 0.02 (2 at. %), 0.05 (5 at. %), 0.1 (10 at. %), and 0.2 (20 at. %)) are explored. The substitution range was limited to the stability range of the brownmillerite structure. Phase purity and the unit cell expansion/contraction by substitution were confirmed by X-ray diffraction. The oxygen intake/release of the substituted samples was characterized by a custom-built volumetric apparatus and iodometric titration. Thermal expansion coefficient and electrical conductivity measurements were carried out on substituted samples. The reversible oxygen intake/release was found to decrease with both Ba and Ca substitution, even though a reduction in activation energy by Ba substitution was observed. This is correlated with an increased bond dissociation energy and a drastic decrease in critical radius of the bottle neck through which oxide ion migration occurs, especially with Ba substitution.
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Acknowledgements
Authors acknowledge Supercomputer Education and Research Centre (SERC), IISc for the access of LabVIEW 7 program. A.M.N. acknowledges Council of Scientific and Industrial Research (CSIR), Govt. of India for the financial support in the form of Junior and Senior Research Fellowship. Authors acknowledge Advanced Facility for Microscopy and Microanalysis, IISc for providing SEM facility. The funding from FIST for XRD and dilatometry facilities is acknowledged.
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AMU contributed to conception and supervision; AMN contributed to experimentation, analysis and interpretation of the results, drafting of original manuscript. All authors have read and contributed to the final version of the manuscript.
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Narayanan, A.M., Umarji, A.M. Effect of oxygen diffusion path radii on the oxygen intake/release properties of Brownmillerite SrCoO\( _{2.5} \). Chem. Pap. 75, 3241–3251 (2021). https://doi.org/10.1007/s11696-021-01555-5
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DOI: https://doi.org/10.1007/s11696-021-01555-5