热敏电阻器
陶瓷
正交晶系
材料科学
温度系数
分析化学(期刊)
兴奋剂
钙钛矿(结构)
化学计量学
电阻率和电导率
粒度
热稳定性
活化能
矿物学
化学
晶体结构
复合材料
结晶学
物理化学
电气工程
光电子学
工程类
有机化学
色谱法
作者
Fang Guan,Ze-wei Dang,Xuan Chen,Shifeng Huang,Jianrong Wang,Xin Cheng,Yiquan Wu
标识
DOI:10.1016/j.jallcom.2021.159269
摘要
A series of Mn-doped LaCrO3 ceramics, LaCr1−xMnxO3 (x = 0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, the concentration of doping Mn), were synthesized by traditional solid-state reaction and their novel electrical properties as the negative temperature coefficient (NTC) thermistors were first investigated. X-ray diffraction results indicate that the Mn-doped LaCrO3 ceramics formed a solid solution with an orthorhombic perovskite structure when x ≤ 0.6, with a tiny amount of Mn2O3 remaining when x = 0.7. The SEM/EDS images and calculated relative densities show that all the LaCr1−xMnxO3 ceramics had a uniform grain size distribution, accurate stoichiometric ratio and high density over 98.0%, enabling them to have high stability. After aging for 1000 h at 150 °C in air, the resistance shifts ΔR/R0 were less than 0.57%. The investigation of electrical properties manifests that the LaCr1−xMnxO3 ceramics had excellent NTC characteristics, and that their resistivities and thermal constants decreased with increasing Mn content and exhibited high controllability. The ρ25°C, B25/50 and activation energy Ea varied in the range of 15.0–51,505.3 Ω cm, 3191–4301 K, and 0.28–0.37 eV, respectively. This combination of parameters makes this system an outstanding candidate for NTC thermistors applied to a low temperature range from − 100 to 200 °C.
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