Preparation, structure and electrical properties of La1−xBaxCrO3 NTC ceramics
Tóm tắt
The La1−xBaxCrO3 (x = 0–0.2) negative temperature coefficient (NTC) ceramics have been prepared by the traditional solid-state reaction method at 1600 °C. Scanning electron microscope images show that the doping of Ba2+ contributes to the increase in the density. X-ray diffraction analysis has revealed that the sintered ceramics crystallize in a single perovskite structure. X-ray photoelectron spectroscopy analysis confirm the existence of Cr3+ and Cr6+ ions on lattice sites, which result in hopping conduction. The presence of the Cr3+ and Cr6+ ions is one of the significant factors that affect the electrical conductivity of La1−xBaxCrO3 ceramics. The resistance of NTC thermistors decreases with the increase of Ba content as a result of the enhancement of Cr6+ Concentration. The obtained values of ρ
−50, B
−50/−25 and E
a are in the range of 49.278–1.9839 × 105 Ω cm, 1767.4–3496.9 K, 0.1523–0.3013 eV, respectively.
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