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Complex impedance analysis of (Y2O3 + CeO2)–YCr0.5Mn0.5O3 composite NTC ceramics
Zhang Bo; Zhao Qing; Chang Aimin; Yao Jincheng; Zhao Pengjun; Guan Fang; Kong Wenwen; Chang, AM
2012
Source PublicationJournal of Alloys and Compounds
ISSN9258388
Volume512Issue:1Pages:132-139
Other Abstract 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.
KeywordImpedance Analysis Ntc Thermistors Grain Boundary
Subject AreaChemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
DOI10.1016/j.jallcom.2011.09.048
Indexed BySCI
WOS IDWOS:000296769400024
Citation statistics
Cited Times:12[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.xjipc.cas.cn/handle/365002/1406
Collection材料物理与化学研究室
Corresponding AuthorChang, AM
AffiliationChinese 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
GB/T 7714
Zhang Bo,Zhao Qing,Chang Aimin,等. Complex impedance analysis of (Y2O3 + CeO2)–YCr0.5Mn0.5O3 composite NTC ceramics[J]. Journal of Alloys and Compounds,2012,512(1):132-139.
APA Zhang Bo.,Zhao Qing.,Chang Aimin.,Yao Jincheng.,Zhao Pengjun.,...&Chang, AM.(2012).Complex impedance analysis of (Y2O3 + CeO2)–YCr0.5Mn0.5O3 composite NTC ceramics.Journal of Alloys and Compounds,512(1),132-139.
MLA Zhang Bo,et al."Complex impedance analysis of (Y2O3 + CeO2)–YCr0.5Mn0.5O3 composite NTC ceramics".Journal of Alloys and Compounds 512.1(2012):132-139.
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