https://doi.org/10.1140/epjp/s13360-024-04968-9
Regular Article
Examination of charge-carriers hopping and identification of relaxation phenomenon and blocking effect in perovskite system
1
Unité de Recherche Matériaux Avancés et Nanotechnologies (URMAN), Institut Supérieur des Sciences Appliquées et de Technologie de Kasserine, Université de Kairouan, BP 471, 1200, Kasserine, Tunisia
2
Laboratoire de Physique Appliquée, Faculté des Sciences de Sfax, Université de Sfax, BP 1171, 3000, Sfax, Tunisia
3
Laboratoire de Physique des Matériaux et des Nanomatériaux Appliquée à l’Environnement, Faculté des Sciences de Gabès Cité Erriadh, Université de Gabès, 6079, Gabès, Tunisia
Received:
21
November
2023
Accepted:
1
February
2024
Published online:
13
February
2024
La0.8Na0.2MnO3 perovskite is successfully synthesized using the conventional solid-state reaction. X-ray diffraction diagram confirms the perovskite compound formation and reveals that the prepared material is crystallized in the rhombohedral structure. Equally, the chemical analysis confirms the theoretical Mn3+/Mn4+ ratio. The complex impedance analysis displays the electrically inhomogeneous nature of LNMO system. Then, it is observed that the electro-active regions are overlapped in the explored frequency range with dominance of grain boundaries effects. The decrease in the blocking factor with temperature increasing reveals the release of charge-carriers from grain boundaries for participating in the conduction process. Moreover, the presence of an inductive character is demonstrated. The electrical conductivity analysis proves the contribution of polaronic and electronic transport in the conduction process. It precisely elucidates the temperature dependence of the energy and distance of electrons hopping. The conductivity spectra investigation is described by the universal dynamic response. The impedance Z″ and the conductivity spectra prove the presence of relaxation process in the studied system. The resemblance and the difference between the calculated activation energies confirm the synchronization of the relaxation phenomenon with hopping process.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
