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Effect of Polaron formation in conduction and dielectric behavior in La0.7Sr0.25K0.05MnO3 oxide

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Abstract

The purpose of this paper is to analyze the dielectric properties of La0.7Sr0.25K0.05MnO3 (LSKM) using impedance spectroscopy over the frequency range of 100 Hz to 1 MHz at different temperatures from 260 to 380 K. In fact, the dielectric analyses of the sample showed two relaxation processes at different relaxation times related to the effect of microstructural inhomogeneities and the contribution of grain and gain boundaries. However, Ac conductivity behavior reveals a metal–semiconductor phase transition at a specific temperature TM-S = 260 K and showed an important impact of the electron–lattice interaction in polaron formation. Also, the conductivity curve is analyzed by Johnscher’s universal power law and the variation of the exponent ‘n’ with temperature suggests the domination of small polaron hopping (SPH) model governed by an activation energy Ea = 0.12 eV. Further investigations using modulus formalism proved the presence of electrical relaxation, which is in good agreement with impedance results. The dielectric poly-dispersive behavior is related to the conduction process and the large value of the dielectric constant \(\varepsilon^{\prime\prime}(\omega )\) in the order of 106 is correlated to the Maxwell–Wagner relaxation.

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Acknowledgements

The authors extend their appreciation to the Deanship of Scientific Research at Majmaah University for funding this work under Project No. (RGP-2019-32).

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Authors and Affiliations

  1. Department of Radiological Sciences and Medical Imaging, College of Applied Medical Sciences, Majmaah University, Majmaah, 11952, Saudi Arabia

    Marwa Selmi

  2. Laboratory of Electronics and Microelectronics, Faculty of Science of Monastir, University of Monastir, Environment Boulevard, 5019, Monastir, Tunisia

    Marwa Selmi

  3. Department of Medical Equipment Technology, College of Applied Medical Sciences, Majmaah University, Majmaah, 11952, Saudi Arabia

    Amor Smida

  4. Unit of Research in High Frequency Electronic Circuits and Systems, Faculty of Mathematical, Physical, and Natural Sciences of Tunis, Tunis El Manar University, 2092, Tunis, Tunisia

    Amor Smida

  5. Laboratoire de La Matière Condensée Et Des Nanosciences, Faculté Des Sciences de Monastir, Université de Monastir, Avenue de l’environnement, 5019, Monastir, Tunisia

    Safwen El Kossi

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Selmi, M., Smida, A. & Kossi, S.E. Effect of Polaron formation in conduction and dielectric behavior in La0.7Sr0.25K0.05MnO3 oxide. J Mater Sci: Mater Electron 32, 6014–6027 (2021). https://doi.org/10.1007/s10854-021-05321-x

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