Electrical conductivity & temperature sensitivity of ceramics based on NiO simple oxides for NTC applications
Electrical conductivity & temperature sensitivity of ceramics based on NiO simple oxides for NTC applications
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DOI：
10.1007/s10854-017-6995-2
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发表时间：
2017-04
期刊：
影响因子：
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通讯作者：
Ziyi Guo;Junming Shao;Heng–Ching Lin;M.-D. Jiang;Shiyuan Chen;Zhicheng Li
中科院分区：
文献类型：
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作者：
Ziyi Guo;Junming Shao;Heng–Ching Lin;M.-D. Jiang;Shiyuan Chen;Zhicheng Li
采用湿化学法制备了不同B2 O3/SiO2添加剂含量的LiF掺杂NiO陶瓷。利用X射线衍射仪、扫描电子显微镜和X射线光电子能谱仪对陶瓷的相组成和显微结构进行了分析。通过电阻-温度特性和复阻抗谱研究了其电导率和热敏性。结果表明，NiO基陶瓷具有立方晶系结构，电阻率具有典型的负温度系数（NTC）特性。不同B_2O_3/SiO_2含量的NiO基陶瓷在3500 ~ 3800 K范围内具有NTC材料常数B值。B_2O_3/SiO_2掺杂对陶瓷的室温电阻率有明显影响，但对B值影响不大。对NiO基陶瓷的导电机制提出了带导和电子跳跃模型。
LiF-doped NiO ceramics with various contents of B2O3/SiO2additives were prepared by a wet-chemical synthesis method. The phase component and micro-structures of the ceramics were detected by using X-ray diffraction, scanning electron microscope and X-ray photoelectron spectroscopy. The related electrical conductivity and thermal sensitivity were investigated by analyzing the resistance–temperature characteristic and complex impedance spectra. The results show that the NiO-based ceramics have the cubic crystalline structure, and show the typical characteristic of negative temperature coefficient (NTC) of resistivity. The NiO-based ceramics, with various contents of B2O3/SiO2, have the NTC materials constantBvalues ranging from 3500 to 3800 K. The substitution of B2O3/SiO2affects obviously the room-temperature resistivity of the ceramics, but has insignificant effect in theBvalues. The band conduction and electron hopping models are proposed for the conduction mechanisms for the NiO-based ceramics.