Abstract
A system of negative temperature coefficient (NTC) thermistors with adjustable room-temperature resistivity (ρ25) and temperature sensitivity should have great application prospect for various requirements. Herein, Sb/Ga co-doped SnO2 ceramics with nominal formula of Sn0.95−xSb0.05GaxO2 (x = 0, 0.01, 0.02, 0.03, 0.04, and 0.05) were fabricated by conventional solid-state reaction process. The phase component, electrical conductivity, temperature sensitivity of resistivity and aging characteristic were investigated. Analysis of X-ray diffraction shows that the prepared SnO2-based ceramics consist of tetragonal phase. The ceramics exhibit typical characteristic of NTC of resistivity. With change of Ga-ion content, the ceramics possess adjustable ρ25 from 3.24 Ω·cm to 0.54 MΩ·cm together with related NTC material constants (B25/85 values) from 140 to 5384 K. The analysis of complex impedance spectra reveals that both band conduction and hopping conduction are responsible for electrical properties of the prepared ceramics. The aging treatment induced at 150 °C revealed that all ceramics exhibit good electrical stability. The possible aging models were investigated by analysis of the change of element valences before and after aging.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Funding
This work is supported by the research funds from the National Natural Science Foundation of China (No. 51767021), Fundamental Research Funds for the Central Universities of Central South University (No. 2022ZZTS0532), Foundation of the Department of Science and Technology of Guizhou Province (No. CG[2021]110), and Development Funds of Hunan Wedid Materials Technology Co., Ltd., China (No. 738010241).
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ZL, HZ, and SZ contributed to the study conception and design. Material preparation, data collection, and analysis were performed by SZ, SL, YW, and HW. The first draft of the manuscript was written by SZ, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Zhang, S., Zhang, H., Leng, S. et al. Electrical properties and aging characteristic of Sb/Ga co-doped single-cation oxide SnO2. J Mater Sci: Mater Electron 33, 23821–23833 (2022). https://doi.org/10.1007/s10854-022-09140-6
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DOI: https://doi.org/10.1007/s10854-022-09140-6