Microstructural properties, dielectric behaviour, conduction mechanism, impedance, and electrical modulus of La0.65Ca0.25Sr0.1MnO3 manganite

The polycrystalline La0.65Ca0.25Sr0.1MnO3 manganite was prepared by the solgel method. Structural analysis showed that our compound is single-phase and crystallizes in the orthorhombic phase with a Pnma space group. A detailed analysis of the electrical and dielectric characteristics of La0.65Ca0.25Sr0.1MnO3 was carried out in the frequency and temperature range by the impedance spectroscopy technique. The electrical property of our compound as electrical conductivity dc reveals the semiconductor behaviour of our sample. At high temperatures, the transport properties of our material are dominated by a thermally activated small polaron jumping mechanism and at low temperature are dominated by a Mott-variable range hopping process. The values of the activation energy have been determined from DC conductivity and impedance, and the same type of charge carriers has been found in the relaxation process and electrical conductivity. The conduction mechanism is governed by the grain boundary. The experimental impedance data of the sample were fitted using Z-view software, to allow modelling an electrical equivalent circuit.

Automated summary

Polycrystalline La0.65Ca0.25Sr0.1MnO3 manganite was prepared by the sol-gel method, and the single-phase compound exhibited semiconductor behavior, with conduction mechanism governed by grain boundaries. Structural and electrical analyses were carried out, revealing transport properties dominated by thermally activated small polaron jumping and Mott-variable range hopping processes at different temperatures.