Abstract
Zr-substituted SnO2-based ceramics (Sn0.95−x Sb0.05Zr x O2, x ≤ 0.1) were prepared by using a wet-chemical synthesis method. The results show that the prepared ceramics have a pure tetragonal phase as that of SnO2 and have a typical characteristic of negative temperature coefficient (NTC) of resistivity over a wide temperature range from −50 to 300 °C. The room-temperature resistivity ρ 25 and material constant B 25/85 of the NTC thermistors increase from 4.77 Ω cm to 4.89 × 107 Ω cm and from 641 to 5085 K, respectively, when the content of Zr, x, changes from 0 to 0.1. The NTC thermistors also show high cyclic stability and ageing resistance. The analysis of impedance spectra reveals that the NTC effect mainly resulted from the grain-boundary contribution, and the conduction mechanisms of the Sn0.95−x Sb0.05Zr x O2 thermistors combine with the electron-hopping conduction and band conduction.
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The authors acknowledge the support of the National Nature Science Foundation of China (No. 51172287).
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Ouyang, P., Zhang, H., Zhang, Y. et al. Zr-substituted SnO2-based NTC thermistors with wide application temperature range and high property stability. J Mater Sci: Mater Electron 26, 6163–6169 (2015). https://doi.org/10.1007/s10854-015-3197-7
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DOI: https://doi.org/10.1007/s10854-015-3197-7