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学科主题: Engineering ; Materials Science ; Physics
题名: Effects of Sr-doping on the electrical properties of MnCoNiO4 NTC ceramics
作者: Wang Junhua; Yao Jincheng; Chen Zhaoyang; Fan Yanwei; Chang Aimin; Jia Dianzeng
通讯作者: Chen, ZY
刊名: JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
发表日期: 2013
DOI: 10.1007/s10854-012-0776-8
卷: 24, 期:2, 页:622-627
收录类别: SCI
资助者: National Natural Science Foundation of Xinjiang, CN 2010211B24; foundation of seed project of Urumqi Science and Technology Bureau K101410009
摘要: The effects of Sr-doping on Ni-Mn-Co-O spinel-structured NTC ceramics were investigated. And the precursors of Sr-doped NiCoMnO4 NTC ceramics were attained by solid state reactions at room temperature, with no intermediate compounds. Its formation and the structural evolutions were characterized by thermo-gravimetry-differential scanning calorimetry, X-ray diffraction and scanning electron microscopy with energy dispersive spectroscopy. Related electrical analyses were also performed. The values of R-298K, B-298/323 constant and the temperature coefficient of resistance alpha(298K) of the thermistors are in the range of 168-1,738 Omega, 3,257-3,359 K and -3.64 to -3.78 % K-1, respectively. Complex impedance analysis shows, for x = 0.2, single semicircular arc whose shape does not have any change with temperature. The grain boundary properties exhibit thermistor parameters with a negative temperature coefficient characteristic. The conduction for the grain boundary could be explained by oxygen vacancies. The results show that the ceramics exhibits a good electrical property because of narrow grain size distribution, controlled morphology, and high purity. This suggests that the electrical properties can be adjusted to desired values by controlling the Sr cation content. This series of materials could be considered as practical materials for NTC thermistor. Most importantly, this new approach greatly simplifies the preparation processes.
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内容类型: 期刊论文
URI标识: http://ir.xjipc.cas.cn/handle/365002/2688
Appears in Collections:新疆维吾尔自治区电子信息材料与器件重点实验室_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;Xinjiang Key Lab Elect Informat Mat & Devices, Urumqi 830011, Peoples R China;Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China;Xinjiang Univ, Inst Appl Chem, Urumqi 830046, Peoples R China

Recommended Citation:
Wang Junhua,Yao Jincheng,Chen Zhaoyang,et al. Effects of Sr-doping on the electrical properties of MnCoNiO4 NTC ceramics[J]. JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS,2013,24(2):622-627.
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