Abstract
Double perovskite La2CrMnO6 ceramics was sintered using standard high temperature route in ambient air. The orthorhombic Pbnm cell characterized by a total disorder between Cr and Mn ions was determined using an XRD powder test. The grain morphology, porosity and chemical composition were determined using scanning electron microscopy. The X-ray photoemission spectroscopy showed several contributions to O 1 s, La 3d, Mn 2p, and Cr 2p core lines related to the occurrence of multiple ionic states. The electrical permittivity, modulus, AC and DC conductivity were measured in ranges of f = 20 Hz – 1 MHz and 76–440 K. The electrical transport mechanism was attributed to the small polarons. The nearest neighbor hopping occurred in the range 170 to 440 K. The variable range hoping, attributed to the Fermi glass features and disorder, was detected in the range 100 to 160 K. The relaxation process related to the temperature-independent activation energy was deduced from the electric modulus scaling.
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Acknowledgments
The first author acknowledges the Directorate of Extramural Research & Intellectual Property Rights (ER & IPR), Defence Res & Dev Orgn (DRDO) of India under grant no. ERIP/ER/1406036/M/01/1566. This research work was performed also under research program 1S-0317-500-1-05-05 of the Institute of Physics, University of Silesia, Poland.
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Mahato, D.K., Molak, A., Szeremeta, A.Z. et al. Determination of polaronic conductivity in disordered double perovskite La2CrMnO6. J Electroceram 42, 136–146 (2019). https://doi.org/10.1007/s10832-018-0164-8
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DOI: https://doi.org/10.1007/s10832-018-0164-8