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学科主题: Materials Science
题名: Preparation and Microwave Sinterability of Mn0.43Ni0.9CuFe0.67O4 NTC Thermistor Materials by Pechini Method
作者: Jin Xian-Jing; Chang Ai-Min; Zhang Hui-Min; Zhang Dong-Yan
关键词: microwave sintering ; microwave calcining ; NTC ; pechini method
刊名: JOURNAL OF INORGANIC MATERIALS
发表日期: 2009
DOI: 10.3724/SP.J.1077.2009.01013
卷: 24, 期:5, 页:1013-1018
收录类别: SCI
摘要: In order to obtain the NTC thermistors with small B constant (about 1900K), applied to wide temperature range, Mn0.43Ni0.9CuFe0.67O4 NTC thermistor materials prepared by Pechini method were microwave-calcined at different temperatures (650 degrees C, 750 degrees C and 850 degrees C). The calcined Mn0.43Ni0.9CuFe0.67O4 powders were pressed and then sintered at 1000 degrees C in a microwave furnace (multimode cavity, 2.45GHz). The crystal structure, phase compositions, morphology and particle size distribution of the samples were analyzed by FT-IR, X-ray diffraction (XRD), scanning electron microscope (SEM) and a laser particle size analyzer. The experimental results show that the electrical properties of the ceramics are strongly dependent on the calcination and sintering process. The application of microwave leads to a lower calcination temperature (650 degrees C) and densified uniform microstructures. Microwave sintering can obtain the components with well uniformity of B constant and resistivity, of which the B-avg is 1930K (deviation of 0.31%) and resistivity rho(avg). is 135 Omega center dot cm (deviation of 4.55%). However, the B-avg is 1720K (deviation of 1.47%) and resistivity rho(avg). is 78 Omega center dot cm (deviation of 25.34%) for the conventionally sintered components. From complex impedance analysis, the grain resistance (R-b) and grain boundary resistance (R-gb) are respectively 255 Omega and 305 Omega for the microwave-sintered samples. The R-b and Rg, are respectively 200 Omega and 230 Omega for conventionally sintered samples.
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内容类型: 期刊论文
URI标识: http://ir.xjipc.cas.cn/handle/365002/1878
Appears in Collections:材料物理与化学研究室_期刊论文

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作者单位: Chinese Acad Sci, Xinjiang Tech Inst Phys & Chem, Urumqi 830011, Peoples R China;Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

Recommended Citation:
Jin Xian-Jing,Chang Ai-Min,Zhang Hui-Min,et al. Preparation and Microwave Sinterability of Mn0.43Ni0.9CuFe0.67O4 NTC Thermistor Materials by Pechini Method[J]. JOURNAL OF INORGANIC MATERIALS,2009,24(5):1013-1018.
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