Abstract
In the present work, we have studied the structural, electrical and dielectrical properties of Pr0.67Ba0.22Sr0.11Mn1−xFexO3 (0 ≤ x ≤ 0.2) materials prepared through the solid state reaction. This study has been performed using admittance spectroscopy technique over a wide range of temperatures (80–340 K) and frequencies (40 Hz–10 MHz). The variation of conductivity with temperature shows a metal–semiconductor transition for x = 0 and 0.05. A semiconductor behavior is noticed for the others compositions. The transition temperature TMS was found to be about 220 and 90 K for samples with x = 0 and 0.05, respectively. It is also found that the conductivity decreases with Fe concentration, such behavior is related to a reduction of double exchange mechanism. The conduction mechanism is described by thermally activated hop** of small polaron. The activation energy of such process is sensitive to the iron concentration. This energy increases with increasing Fe content from Ea = 22 meV for x = 0 to Ea = 67 meV for x = 0.20. The dielectric permittivity as function of the temperature is characterized by the appearance of dielectric transition which is described by the Curie–Weiss law. The dielectric transition temperature Td change with the iron concentration and it is found to be 100, 170, 140 and 180 K for x = 0.05, 0.10, 0.15 and 0.20, respectively.
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The Tunisian Ministry of Higher Education and Scientific Research have supported this study.
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Snini, K., Rahmouni, H., Ben Jemaa, F. et al. Investigation of structural, electrical and dielctrical properties of Pr0.67Ba0.22Sr0.11Mn1−xFexO3 (0 ≤ x ≤ 0.2) perovskite. J Mater Sci: Mater Electron 29, 2585–2592 (2018). https://doi.org/10.1007/s10854-017-8182-x
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DOI: https://doi.org/10.1007/s10854-017-8182-x