Investigations of electrical properties of Pr 0.65 Ca 0.25 Cd 0.1 MnO 3 ceramic
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Investigations of electrical properties of Pr0.65 Ca0.25 Cd0.1 MnO3 ceramic A. Khlifi1, R. Hanen1, A. Mleiki1,2,a A. Cheikhrouhou2
, H. Rahmouni1, N. Guermazi3 , K. Khirouni4 ,
1 Unité de recherche Matériaux Avancés et Nanotechnologies (URMAN), Institut Supérieur des Sciences
Appliquées et de Technologie de Kasserine, Kairouan University, BP 471, 1200 Kasserine, Tunisia
2 LT2S, Digital Research Center of Sfax, Sfax Technoparc, 3021 Sfax, Tunisia 3 Laboratoire de Génie des Matériaux et Environnement (LGME), Ecole Nationale d’Ingénieurs de Sfax
(ENFS), BP 1173-3038, Sfax, Tunisia
4 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: 8 August 2020 / Accepted: 22 September 2020 © Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Pr0.65 Ca0.25 Cd0.1 MnO3 ceramic was elaborated using the conventional solid-state reaction technique. The polycrystalline sample was subjected to investigate by ac impedance spectroscopy. From the main results, the electrical conductivity analysis confirms the semiconductor behavior and indicates that the hopping process governs the electrical conductivity. From ac-conductivity, two distinct mechanisms are observed. Indeed, the conduction mechanism is attributed to the correlated barrier hopping model in the middle of the frequency region and the overlapping large polaron tunneling in the high-frequency one. The analyzed impedance and modulus confirmed the presence of non-Debye-type relaxation phenomenon. Different electrical equivalent circuits were used to analyze the Nyquist plots. The obtained results confirm the contribution of grain boundary on the conduction. The increase in dielectric constant and the rate of its increase at low frequency were related to the disorder of the cation sublattices.
1 Introduction For many decades, solid oxide fuel cells (SOFCs) have attracted much attention, as a new electric power source, due to the efficiency of high energy conversion and the absence of air pollution emission. The electrolytes and electrodes are the essential components of the SOFC. However, the performance of this later remains dependent on the electrical conductivity and the overpotential of the cathode–electrolytes interface as reported in Ref [1]. In addition, the electrical conductivity and cathodic overpotentials are very sensitive to the rare earth cations used for the A-sites of perovskite oxide [2–6]. In this context, manganite materials have been studied and widely used as a cathode for SOFC [7]. In addition, these materials have essential utilization in numerous applications such as magnetic sensors, computer memory systems, and magnetic refrigerants [8–10]. The Pr-based manganite is one of the important members in the manganite family due to their variety of phases, multifunctional properties, and their
a e-mail: [email protected] (corresponding author)
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