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Erschienen in:
15.03.2017
Characterization and electrical conductivity of La1−xSrxCrO3 NTC ceramics
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 13/2017
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Abstract
The La1−xSrxCrO3 (x = 0–0.1) negative temperature coefficient (NTC) ceramics have been prepared by the traditional solid state reaction method. X-ray diffraction (XRD) analysis has revealed that the as-sintered ceramics crystallize in a single perovskite structure. Scanning Electron Microscope (SEM) images show that the doped Sr2+ contributes to in the decrease in porosity. X-ray photoelectron spectroscopy (XPS) analysis indicates the existence of Cr3+ and Cr6+ ions on lattice sites, which result in hopping conduction. The presence of the Cr6+ is one of the key factors that affect the electrical conductivity of La1−xSrxCrO3. Resistance–temperature characteristics were studied in the range of −80 to 10 °C for the ceramic samples, the electrical characterizations show that the electrical resistivity and material constant B decrease with the increase of the strontium content.