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Published in:
14-02-2017
New NTC thermistors based on LaCrO3–Mg(Al0.7Cr0.3)2O4 composite ceramics
Published in: Journal of Materials Science: Materials in Electronics | Issue 11/2017
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Abstract
In this study, the xLaCrO3–(1−x)Mg(Al0.7Cr0.3)2O4 (x = 0.1, 0.2, 0.3, 0.4) negative temperature coefficient composite ceramics were fabricated through conventional solid state reaction at 1650 °C. X-ray diffraction analysis has revealed that the sintered ceramics are consisted of cubic spinel Mg(Al0.7Cr0.3)2O4 phase and orthorhombic perovskite LaCrO3 phase. The obtained values of \({{\rho }_{\text{300}}}\) and \({{B}_{400/800}}\) and \({{E}_{\text{a}}}\) are in the range of 1.55 × 102–1.41 × 108 Ωcm, 756–11317 K, 0.065–0.976 eV, respectively. The electrical properties of these ceramics can be adjusted by the LaCrO3 contents. Such ceramics could be suitable for high temperature NTC thermistor application.