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Physical properties of the perovskite SrTiO3−δ synthetized by chemical route

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Abstract

The perovskite SrTiO3−δ elaborated by chemical route was characterised by physical and electrochemical methods. The oxide crystallizes in a cubic structure with a lattice parameter of 3.907(5) Å and a crystallite dimension of 71 nm. The morphology visualized by the SEM-EDX analysis shows spherical grains with a mean size of 0.2 μm, formed by agglomeration of crystallites. The diffuse reflectance gave a gap (Eg) of 3.21 eV, ascribed to the charge transfer O2−: 2p → Ti4+: 3d. The thermal variation of the conductivity (σ) obeys an exponential law {σ = σoexp-0.27 eV/T} assigned to low hopping polarons. The electrochemical characterization was undertaken in Na2SO4 solution (10− 1 M) and the n-type character demonstrated from the capacitance measurement and cyclic voltammetry under UV-irradiation, is due to oxygen deficiency. A flat band potential (Efb) of − 0.31 VSCE was determined with a depletion width extended up to ~ 4 μm, advantageous for the formation of electron / hole (e− / h+) pairs. The electrochemical stability against photocorrosion was also shown from the semi-logarithmic plot (log J–E). As application, the Congo Red a diazo dye (CR) is successfully oxidized under UV light on SrTiO3−δ; an abatement of 63% was reached. According to the scavengers mechanism, hydroxyl •OH is the main specie responsible for the CR oxidation. The discoloration follows a pseudo-first-order kinetic with a half-life of 189 min.

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Acknowledgements

The authors are grateful to Dr K. khenfer for the XRD analysis.

Funding

The financial support of this work was provided by the Universities of Boumerdes (UMBB) and Algiers (USTHB), Algeria).

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Authors and Affiliations

  1. Laboratory of Soft Technologies and Biodiversity, Faculty of Sciences, University M’hamed Bougara, 35000, Boumerdes, Algeria

    S. Merrad & M. Abbas

  2. Laboratory of Storage and Valorization of Renewable Energies, Faculty of Chemistry (USTHB), BP 32, 16111, Algiers, Algeria

    S. Merrad, R. Brahimi, B. Bellal & M. Trari

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Contributions

SM: performed the experiments, wrote and discussed the results, MA: Visualization and Editing the work, RB: performed electrochemical experiments and Formal analysis, BB: performed and discussed the optical results, MT: Validation of the manuscript and supervised the results.

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Merrad, S., Abbas, M., Brahimi, R. et al. Physical properties of the perovskite SrTiO3−δ synthetized by chemical route. J Mater Sci: Mater Electron 34, 206 (2023). https://doi.org/10.1007/s10854-022-09616-5

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