Electrical properties of Sr𝑥Ba1−ð�?�¥Fe0.6Sn0.4O3−𝜀 NTC thermistors

Bulletin of materials science

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: Sr𝑥Ba1−ð�?�¥Fe0.6Sn0.4O3−𝜀;    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, Sr_ð‘�?Ba_{1−ð�?��?}Fe_0.6Sn_0.4O_{3−𝜀} (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 Sr_ð‘�?Ba_{1−ð�?��?}Fe_0.6Sn_0.4O_{3−𝜀} 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 (ρ₉₈2), thermistor constant (𝐵_298/358) and activation energy (𝐸_a) of the Sr_ð‘�?Ba_{1−ð�?��?}Fe_0.6Sn_0.4O_{3−𝜀} 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