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

The polycrystalline La 0.65 Ca 0.25 Sr 0.1 MnO 3 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 La 0....

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Bibliographic Details
Published in:Applied physics. A, Materials science & processing Materials science & processing, 2021-12, Vol.127 (12), Article 931
Main Authors: Aydi, S., Chérif, W., Khammassi, F., Sales, A. J. M., Ferreira, N. M., Zouari, N.
Format: Article
Language:English
Subjects:
Applied physics
Characterization and Evaluation of Materials
Condensed Matter Physics
Current carriers
Dielectric properties
Electrical resistivity
Equivalent circuits
Grain boundaries
High temperature
Low temperature
Machines
Manganites
Manufacturing
Materials science
Nanotechnology
Optical and Electronic Materials
Orthorhombic phase
Physics
Physics and Astronomy
Processes
Structural analysis
Surfaces and Interfaces
Thin Films
Transport properties
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Summary:The polycrystalline La 0.65 Ca 0.25 Sr 0.1 MnO 3 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 La 0.65 Ca 0.25 Sr 0.1 MnO 3 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.
ISSN:0947-8396
1432-0630
DOI:10.1007/s00339-021-05057-9