Abstract
The NiFe2−xSb x O4 (x = 0.0, 0.008, 0.01, 0.015, 0.02) ceramics were prepared by a wet chemical process. The related ceramics were obtained by powders compacting and sintering by conventional ceramic processing. The phase component, cationic valence and electrical properties of the prepared ceramics were investigated. The investigation results indicate that NiFe2−xSb x O4 ceramics have a cubic spinel structure and display a typical characteristic of negative temperature coefficient (NTC) of resistivity. The room temperature resistivity of NiFe2−xSb x O4 ceramics can be adjusted from 75597 to 2714 Ω cm by changing the contents of Sb, and the ceramics hold high thermal sensitivity with NTC material constants between 3612 and 5408 K. The investigation of impedance spectra measured at different temperatures revealed that the grain effect and grain-boundary effect contribute simultaneously to the electrical conductivity and NTC effect. Conduction mechanism of NiFe2−xSb x O4 NTC thermistors are proposed to follow the polaron hopping model.
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The authors acknowledge the support by the Natural Science Foundation of China (No. 51767021) and the Jiangxi Yunjia High Tech Co., Ltd. (No. 738010128).
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Fu, W., Li, Z., Li, P. et al. Electrical property and temperature sensitivity of NiFe2−xSb x O4 (x ≤ 0.02) ceramics for negative temperature coefficient thermistors. J Mater Sci: Mater Electron 29, 11637–11645 (2018). https://doi.org/10.1007/s10854-018-9261-3
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DOI: https://doi.org/10.1007/s10854-018-9261-3