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学科主题: Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
题名: Complex impedance analysis of (Y2O3 + CeO2)–YCr0.5Mn0.5O3 composite NTC ceramics
作者: Zhang Bo; Zhao Qing; Chang Aimin; Yao Jincheng; Zhao Pengjun; Guan Fang; Kong Wenwen
通讯作者: Chang, AM
关键词: Impedance analysis ; NTC thermistors ; Grain boundary
刊名: Journal of Alloys and Compounds
发表日期: 2012
DOI: 10.1016/j.jallcom.2011.09.048
卷: 512, 期:1, 页:132-139
收录类别: SCI
资助者: National Natural Science Foundation of Xinjiang, CN 2010211A59; Science & Technology Project of Urumqi, Xinjiang, CN G08211002; Economic and Informatization Commission, Xinjiang, CN 1039571301
摘要: Ceramic compositions based on (aY2O3 + bCeO 2)-0.4YCr0.5Mn0.5O3 (a + b = 0.6) were prepared by conventional solid state reaction at 1200 °C, and sintered under air atmosphere at 1600 °C. For 0 ≤ a < 0.6, XRD patterns have shown that the major phases presented in the calcined powders are Y 2O3, CeO2 and orthorhombic perovskite YCr 0.5Mn0.5O3 phase, respectively. SEM and EDAX observations confirm the YCr0.5Mn0.5O3 phases mostly exist at the grain, whereas the Y2O3 and CeO 2 phases mainly exist at the grain boundaries. Complex impedance analysis shows that, for 0 < a ≤ 0.6, single semicircular arc whose shape does not show any change with temperature. Nevertheless, for a = 0, two overlapping semicircular arcs are observed at and above 300 °C. The grain boundary properties exhibit thermistor parameters with a negative temperature coefficient characteristic. The relaxation behavior and conduction for the grain boundary could be due to a space-charge relaxation mechanism and oxygen vacancies, respectively.
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内容类型: 期刊论文
URI标识: http://ir.xjipc.cas.cn/handle/365002/1406
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 Sch, Beijing 100049, Peoples R China;Xinjiang Key Lab Elect Informat Mat & Devices, Urumqi 830011, Peoples R China

Recommended Citation:
Zhang Bo,Zhao Qing,Chang Aimin,et al. Complex impedance analysis of (Y2O3 + CeO2)–YCr0.5Mn0.5O3 composite NTC ceramics[J]. Journal of Alloys and Compounds,2012,512(1):132-139.
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文件名: Complex impedance analysis of (Y2O3 + CeO2)–YCr0.5Mn0.5O3 composite NTC ceramics.pdf
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