Low-cost preparation of La4Co3O9 perovskite thin films with distinct absorbance ability and ferromagnetic behaviour |
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| Affiliation: | 1. Laboratory of Theory and Simulation of Materials, University of Oran 1 Ahmed Ben Bella, Algeria;2. Physics Faculty, Department of Physics Genius, University of Science and Technology of Oran, Oran, Algeria;3. Department of Physics, College of Science, Princess Nourah Bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia;4. Laboratoire de Physique des Matériaux, Faculté des Sciences de Bizerte, Université de Carthage, 7021, Zarzouna, Tunisia;5. Research Center in Industrial Technologies (CRTI), P.O.Box 64, Cheraga, 16014, Algiers, Algeria;6. Laboratoire de Nanomatériaux et Systèmes Pour Energies Renouvelables, Centre de Recherches et des Technologies de L’Energie, Technopôle de Borj-Cédria, BP, 95 Hammam-Lif, Tunisia;7. Physics Department, College of Sciences, University of Bisha, P.B.551, Bisha, 61922, Saudi Arabia;8. Sciences Faculty of Tunis, University of Tunis El Manar, 2092, Tunisia |
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| Abstract: | La4Co3O9 perovskite thin film was grown on a glass substrate using spray pyrolysis technique at 460 °C. X-ray diffraction (XRD) pattern indicates a high orthorhombic structure in Ruddlesden-Popper phase along (040) orientation. A nanometric scale size varying between 10 and 20 nm of the La4Co3O9 films were proved via Transmission Electron Microscopy (TEM). The High-Resolution Transmission Electron Microscopy (HRTEM) specifically displayed the lattice fringe among the (040) and (1 10 0) planes. A direct transition band was revealed in the synthesized La4Co3O9 films through transmittance and reflectance spectra, with a band gap of 1.42 eV. Urbach effect as well as a relatively high absorptivity were evidenced. The prepared thin films exhibit a ferromagnetic behaviour. The saturated magnetization (MS) and coercive field (HC) were equal to MS = 4.69810?4 emu/g and an HC = 45.56 Oe, respectively, at room temperature. The revealed ferromagnetic behaviour was due to the non-stoichiometry of La4Co3O9 constituents. The present work emphasizes the specificity and suitability of La4Co3O9 thin film perovskite for magneto-optical applications. |
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| Keywords: | Sprayed thin films Spider's effect Ruddlesden-popper phase Urbach effect Ferromagnetic material |
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