Electrical conductivity and electrical stability of Bi/Mg modified NiO ceramics for NTC thermistors
| Autor: | Huang Linling, Li Zhicheng, Li Kaifeng, Zhang You, Zhang Hong, Leng Senlin |
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| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Processing and Application of Ceramics, Vol 17, Iss 2, Pp 172-180 (2023) |
| Druh dokumentu: | article |
| ISSN: | 1820-6131 2406-1034 |
| DOI: | 10.2298/PAC2302172H |
| Popis: | 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. |
| Databáze: | Directory of Open Access Journals |
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