Bulletin of materials science | |
Electrical properties of Srð‘¥Ba1−ð�?�¥Fe0.6Sn0.4O3−𜀠NTC thermistors | |
X W Zhang1  C L Yuan2  X Y Liu2  J W Xu1  C R Zhou1  | |
[1] School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, Guangxi, China$$School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, Guangxi, ChinaSchool of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, Guangxi, China$$;School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, Guangxi, China$$College of Materials Science and Engineering, Central South University, Changsha 410083, China$$School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, Guangxi, ChinaSchool of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, Guangxi, China$$College of Materials Science and Engineering, Central South University, Changsha 410083, China$$College of Materials Science and Engineering, Central South University, Changsha 410083, ChinaSchool of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, Guangxi, China$$College of Materials Science and Engineering, Central South University, Changsha 410083, China$$ | |
关键词: Srð‘¥Ba1−ð�?�¥Fe0.6Sn0.4O3−ðœ€; NTC thermistors; electrical properties.; | |
DOI : | |
学科分类:材料工程 | |
来源: Indian Academy of Sciences | |
【 摘 要 】
Polycrystalline thermistor ceramics with the stoichiometric formula, Srð‘�?Ba1−ð�?��?Fe0.6Sn0.4O3−𜀠(0.2 â‰�? ð‘�? â‰�? 0.8), had been prepared by a standard solid state reaction route. X-ray diffraction analysis indicates that the ceramic system remains cubic perovskite structure with a very small lattice change. The electrical properties of Srð‘�?Ba1−ð�?��?Fe0.6Sn0.4O3−𜀠thermistors were studied using a digital thermometer over a wide range of 298â€�??400 K. The thermistors showed an excellent negative temperature coefficient (NTC) thermistor behaviour. The values of resistivity at 298 K (Ï982), thermistor constant (ðµ298/358) and activation energy (ð¸a) of the Srð‘�?Ba1−ð�?��?Fe0.6Sn0.4O3−𜀠thermistors, decreasing with the increase of Sr content, were in the range of 0.37â€�??11.0 kð›�?.cm, 2466â€�??3703 K and 0.212â€�??0.319 eV, respectively. For the thermistors with the compositions ð‘�? = 0.2 and 0.4, the fitting equivalent circuit was composed of three RCPE elements corresponding to grain, grain boundary and ceramicâ€�?�electrode interface, respectively. From the impedance plots, it was found that the fitting data showed good agreement with the experimental data. The extracted grain boundary resistance exhibited a NTC thermistor behaviour.
【 授权许可】
Unknown
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