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Co0. 8Mn0. 8 Ni0. 9 Fe0. 5 O4 纳米粉体的制备及热敏特性研究
张东炎; 张惠敏; 靳先静; 常爱民
Source Publication无机材料学报


Other Abstract

Nano-powders of Co0.8Mn0.8Ni0.9 Fe0.5O4 NTC (Negative Temperature Coefficient) thermistor materials were prepared by co-precipitation method with NH4HCO3 as precipitator. The effects of calcination temperature on the material phase were studied. The influences of different sintering processes on the microstructure and thermal sensitive characteristics of NTC thermistor materials were investigated. The samples were characterized by XRD, TG/DTA, FT-IR, SEM, and Laser Particle Size Analyzer. The results show that the powders calcined at 750°C are single spinel, the grain size of the powders is about 32.1 nm, and the particle size is about 50-100 nm. The samples possess better electrical properties: ρ25°C=1183 Ω·cm, B25/50=3034 K under the process conditions of constant temperature 840°C and 1200°C for 2 h respectively, the heating and cooling rate of 1°C/min. It is found that proper sintering process can effectively improve the microstructure and thermal sensitive properties of the NTC thermistor materials. According to the calculation from the slope of lnρ-1/T curves, the activation energy is about 0.26 eV.

KeywordNtc热敏电阻 纳米粉体 共沉淀法 电阻率
Subject AreaMaterials Science
Indexed BySCI ; CSCD
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Cited Times:3[CSCD]   [CSCD Record]
Document Type期刊论文
Recommended Citation
GB/T 7714
张东炎,张惠敏,靳先静,等. Co0. 8Mn0. 8 Ni0. 9 Fe0. 5 O4 纳米粉体的制备及热敏特性研究[J]. 无机材料学报,2009,24(5):1008-1012.
APA 张东炎,张惠敏,靳先静,&常爱民.(2009).Co0. 8Mn0. 8 Ni0. 9 Fe0. 5 O4 纳米粉体的制备及热敏特性研究.无机材料学报,24(5),1008-1012.
MLA 张东炎,et al."Co0. 8Mn0. 8 Ni0. 9 Fe0. 5 O4 纳米粉体的制备及热敏特性研究".无机材料学报 24.5(2009):1008-1012.
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