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题名: Preparation and characterization of NTC NiMn<inf>2</inf>O<inf>4</inf>-La<inf>1-x</inf>Ca<inf>x</inf>MnO<inf>3</inf> (0&lex&le0.3) composite ceramics
作者: ZhangHui Min ; GuanFang ; ChangAi Min ; ZhaoLi Jun
会议名称: 2013 2nd International Conference on Materials Science and Technology, ICMST 2013
会议日期: April 11, 2013 - April 12, 2013
出版日期: 2013
会议地点: Hong Kong, China
出版地: Trans Tech Publications Ltd, Kreuzstrasse 10, Zurich-Durnten, CH-8635, Switzerland
收录类别: EI
ISSN: 10226680
ISBN: 9783037857137
部门归属: (1) Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi 830011, China
摘要: Composite ceramics made of spinel structure NiMn2O4 and CaO-doped perovskite structure LaMnO3 were prepared by a conventional solid state reaction and sintered at different temperatures. The XRD patterns have shown that the major phases presented in the sintered samples are NiMn2O4 compounds with the spinel structure, La1-xCaxMnO3 with the perovskite structure and NiO with a monoclinic structure. SEM images show that the density and grain size of the composite ceramics increases with sintered temperature increasing. The electrical resistivity of the composite ceramics at 25 °C is found to change significantly depending on the CaO content, while the thermal constant B is still reasonably large in the range of 2400 to 3000 K. For the composition x = 0.1, the composite with a low electrical resistivity (ρ25 °C=4.46 ω · cm) and moderate B value (B25/50=2762K) was obtained. These composites could be applied as potential candidates for NTC thermistors in the suppression of the inrush current.
语种: 英语
内容类型: 会议论文
URI标识: http://ir.xjipc.cas.cn/handle/365002/3621
Appears in Collections:材料物理与化学研究室_会议论文

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