Preparation and electrical properties of Mn1.05鈭?/sub>yCo1.95鈭?/sub>x鈭?/sub>z鈭?/sub>wNixMgyAlzFewO4 NTC ceramic derived from microemulsion method
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- 作者：Junbo Xia ; Qing Zhao ; Bo Gao ; Aimin Chang ; Bo Zhang ; Renjun Ma
- 关键词：NTC thermister ; Ceramic ; Microstructure ; Sintering ; Resistance
- 刊名：Journal of Alloys and Compounds
- 出版年：5 April, 2014
- 年：2014
- 卷：591
- 期：Complete
- 页码：207-212
- 全文大小：2255 K
文摘
The NTC thermistor nano-powders of Mn1.05鈭?/sub>yCo1.95鈭?/sub>x鈭?/sub>z鈭?/sub>wNixMgyAlzFewO4 were prepared by microemulsion method. Scanning electron microscope (SEM) image showed that the particles were well distributed. The mean particle-size was 72 nm. The structure of the precursor was investigated with Fourier infrared spectrometer (FI). The compositions of the powder and the as-sintered ceramic were evaluated by Energy Disperse Spectroscopy (EDS). X-ray diffraction (XRD) result indicated that the sintered samples were in the spinel structure. The room temperature resistivity 蟻25, material constant B25/85 and activation energies of the NTC thermistor are in the range of 1173-19,059 惟 cm, 3169-3771 k, 0.2672-0.3136 eV. The room temperature resistivity and B25/85 constant were found to increase with Al2O3 content. The Mn0.9Co1.2Ni0.21Mg0.15Al0.09Fe0.45(A2) and Mn0.9Co1.2Ni0.27Mg0.15Al0.03Fe0.45(A3) specimens both showed a 200 掳C resistance drift (螖R/R) within 10% after aging at 910 掳C for 600 h.