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Microstructures and electrical properties of Sr0.6Bi0.4Fe0.6Sn0.4O3–BaCoII 0.02CoIII 0.04Bi0.94O3 thick-film thermistors with low room-temperature resistivity

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Abstract

The thick film NTC thermistor of compositions Sr0.6Bi0.4Fe0.6Sn0.4O3 + BaCoII 0.02CoIII 0.04Bi0.94O3, synthesized by solid state reaction, were prepared by screen-printing on alumina substrate. The microstructures, composition dependent, impedance characteristics, self-heating behaviours and thermistor properties were investigated. The relation between logarithm of resistivity and reciprocal of absolute temperature for the thick film thermistor was almost linear for all the compositions studied. The room-temperature resistivity, thermistor constant and activation energy of the films decreased with increasing BaCoII 0.02CoIII 0.04Bi0.94O3 content and were in the range of 18.2–945.7 Ω cm, 1,753–2,649 K and 0.151–0.228 eV, respectively. The thick films showed the nearest-neighbor hopping or variable-range hopping model depended on the compositions. Impedance analysis indicated that the resistivity value of the thick films was mainly ascribed to the contribution of grains. At higher BaCoII 0.02CoIII 0.04Bi0.94O3 content, a good self-heating effect of one thermistor film was observed.

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Acknowledgments

Financial supports of the National Natural Science Foundation of China (Grants No. 51102055) and the Natural Science Foundation of Guangxi (Grants No. 2011GXNSFA018028) are acknowledged by the authors.

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Authors and Affiliations

  1. School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin, 541004, People’s Republic of China

    Changlai Yuan, Tao Yang, Changrong Zhou, Guohua Chen & Yun Yang

  2. Guilin Academy of Air Force, Guilin, 541004, People’s Republic of China

    Ying Luo

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  1. Changlai Yuan
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  2. Tao Yang
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  3. Ying Luo
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  4. Changrong Zhou
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Correspondence to Changlai Yuan.

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Yuan, C., Yang, T., Luo, Y. et al. Microstructures and electrical properties of Sr0.6Bi0.4Fe0.6Sn0.4O3–BaCoII 0.02CoIII 0.04Bi0.94O3 thick-film thermistors with low room-temperature resistivity. J Mater Sci: Mater Electron 25, 3967–3976 (2014). https://doi.org/10.1007/s10854-014-2115-8

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