Structural, electrical conductance and complex impedance analysis of (Nd1−xCex)0.7Sr0.3MnO3 (0≤x≤0.20) perovskite

Abstract

International audiencePolycrystalline samples of (Nd1−xCex)0.7Sr0.3MnO3 (x=0, 0.10 and 0.20) were prepared by a high-temperature solid-state reaction technique. The X-ray diffraction study has shown that all the samples exhibit a single phase with orthorhombic structure (space group Pnma). From the resistivity data, it is found that all the samples show metal to semiconductor transition and the transition temperature decreases with the Ce doping. The complex impedance has been investigated in the temperature range 80–320 K and in the frequency range 40 Hz–1 MHz. AC conductance analyses indicate that the conduction mechanism is strongly dependent on temperature and frequency. The impedance plane plot shows semicircle arcs at different temperatures and an electrical equivalent circuit has been proposed to explain the impedance results. The activation energies obtained from the conductance is slightly higher than that from time relaxation analyse

Synthesis and study of impendence spectroscopy properties of La0.6Ca0.2Na0.2MnO3 manganite perovskite prepared using sol–gel method

“…4a. This figure proves that the sample experienced a metal-semiconductor (MS) transition at TMS = 240 K. Similar transitions from the conductivity curves were observed in other works [33][34][35][36][37]. In addition, all the s-values are greater than unity.…”

Electrical conductance and complex impedance analysis of La0.6Pr0.1Ba0.3Mn1−xNixO3 nanocrystalline manganites

“…In contrast, these values decrease with temperature, above T MS , which indicates the presence of thermally activated conduction mechanism in this system which is similar to a semiconducting behavior. Such behavior has been reported in other ceramics [37,38]. In the other hand, the obtained R g and R gb values are lower for x = 0 than for x = 0.1 which makes the La 0.6 Pr 0.1 Ba 0.3 Mn 0.9 Ni 0.1 O 3 sample lesser conductor as compared with La 0.6 Pr 0.1 Ba 0.3 MnO 3 sample.…”

Analysis of the electrical transport, conductivity, and dielectric relaxation behavior of La0.75 Ba0.10 Sr0.15 Fe O2.875-δ (δ = 0.375 and 0.50) brownmillerite oxides

“…The Rp and R Wp factors displayed much higher values than expected, which is accounted for in terms of the peaks with small intensities [21]. The difference between the tted and experimental intensities of the re ection peaks may be assigned to preferred orientation effects [23,24]. The re ection peaks were crystallized in the monoclinic system with P2/m space group.…”