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题名: MgAl2O4-LaCr0.5Mn0.5O3 composite ceramics for high temperature NTC thermistors
作者: Zhang, Bo; Zhao, Qing; Chang, Aimin; Yan, Haixue; Wu, Yiquan
通讯作者: Chang, AM
刊名: JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
发表日期: 2013
DOI: 10.1007/s10854-013-1424-7
卷: 24, 期:11, 页:4452-4456
收录类别: SCI ; EI
摘要: New negative temperature coefficient (NTC) ceramics based on xMgAl 2O4-(1 - x)LaCr0.5Mn0.5O3 (x = 0, 0.4, 0.6, 0.8) composition were investigated. The composite ceramics (x = 0.4, 0.6, 0.8) consisted of two phases: a cubic spinel MgAl2O 4 phase and an orthorhombic perovskite LaCr0.5Mn 0.5O3 phase isomorphic to LaCrO3. The brighter regions were the LaCr0.5Mn0.5O3 and the darker was the MgAl2O4. There was ion diffusion between these two phases. X-ray photoelectron spectroscopy analysis corroborated the presence of Cr3+, Cr4+, Mn3+ and Mn4+ ions on lattice sites, which may result in the hopping conduction. The ρ 300 and B 400/800 constant increased with increasing MgAl2O4 content. The values of ρ 300, B 400/800 and activation energy of NTC thermistors were in the range 1.76-1.22 × 108 Ωcm, 2,646-8,711 K, 0.228-0.746 eV, respectively. This means the electrical properties can be adjusted to desired values, depending on the MgAl2O4 content.
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内容类型: 期刊论文
URI标识: http://ir.xjipc.cas.cn/handle/365002/3857
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 Key Lab Elect Informat Mat & Devices, Key Lab Funct Mat & Devices Special Environm, Xinjiang Tech Inst Phys & Chem, Urumqi 830011, Peoples R China;Alfred Univ, Kazuo Inamori Sch Engn, Alfred, NY 14802 USA;Univ Chinese Acad Sci, Beijing 100049, Peoples R China;Univ London, Sch Engn & Mat Sci, London E1 4NS, England

Recommended Citation:
Zhang, Bo,Zhao, Qing,Chang, Aimin,et al. MgAl2O4-LaCr0.5Mn0.5O3 composite ceramics for high temperature NTC thermistors[J]. JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS,2013,24(11):4452-4456.
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文件名: MgAl2O4–LaCr0.5Mn0.5O3 composite ceramics for hightemperature NTC thermistors.pdf
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