Processing and Application of Ceramics 2023 Volume 17, Issue 2, Pages: 172-180
https://doi.org/10.2298/PAC2302172H
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Electrical conductivity and electrical stability of Bi/Mg modified NiO ceramics for NTC thermistors
Huang Linling (School of Materials Science and Engineering, Central South University, Changsha, China), hzhang@csu.edu.cn
Li Zhicheng (School of Materials Science and Engineering, Central South University, Changsha, China), 764546880@qq.com
Li Kaifeng (School of Materials Science and Engineering, Central South University, Changsha, China)
Zhang You (School of Materials Science and Engineering, Central South University, Changsha, China)
Zhang Hong (School of Materials Science and Engineering, Central South University, Changsha, China)
Leng Senlin (School of Material and Chemical Engineering, Tongren University, Tongren, China)
Thermistors with negative temperature coefficient (NTC) of resistivity are
important components for temperature sensors and actuators. High material
constant (B value) of NTC thermistor, i.e. high-temperature sensitivity, is
one of key focuses. Herein, Bi/Mg modified NiO based ceramics for NTC
thermistors were prepared by conventional solid-state reaction method.
Introduction of Bi2O3 significantly enhances the sintering ability of
ceramics and reduces the sintering temperature from 1380 to 1250°C.
Mg-doping (i.e. preparation of Ni1-xMgxO ceramics, where x=0, 0.02, 0.05,
0.07 and 0.1) has significant effect on room temperature resistivity (ρ25).
Phase composition, microstructure, electrical property and electrical
stability were investigated. All prepared ceramics have the phase with
rock-salt structure and show typical NTC characteristics with B values
higher than 5300K. The electrical stability with an optimized
resistance-change rate of 1.02%after being aged at 150°C for 500 h is
achieved. The electrical properties of the ceramics were analysed by
combining X-ray photoelectron spectra with complex impedance spectra.
Keywords: Bi/Mg modified NiO ceramics, electrical properties, aging, impedance spectroscopy, thermistors
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