Journal
PHASE TRANSITIONS
Volume 89, Issue 9, Pages 958-969Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/01411594.2015.1120872
Keywords
magnetic materials; electrical properties; impedance spectroscopy
Categories
Funding
- Tunisian National Ministry of Higher Education, Scientific Research
- French Ministry of Higher Education
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La0.67Sr0.16Ca0.17MnO3 perovskite was prepared by the solid-state reaction technique. Preliminary room-temperature structural studies confirm the formation of the sample in the rhombohedral structure. The electrical response was studied using the impedance spectroscopy technique over a broad frequency range (250 Hz-3 MHz). The results indicate that the electrical properties of the material are strongly dependent on temperature and frequency. Impedance spectrum analysis shows that the material can be described as a grain and grain boundary medium and permits to estimate the grain boundary contribution. Electronic conduction is found to be dominated by a thermally activated hopping of small polaron at high temperatures.
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