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Preparation and characterization of NTC NiMn2O4-La1-xCaxMnO3 (0&lex&le0.3) composite ceramics
ZhangHui Min; GuanFang; ChangAi Min; ZhaoLi Jun
2013
Conference Name2013 2nd International Conference on Materials Science and Technology, ICMST 2013
Pages78-83
Conference DateApril 11, 2013 - April 12, 2013
Conference PlaceHong Kong, China
Publication PlaceTrans Tech Publications Ltd, Kreuzstrasse 10, Zurich-Durnten, CH-8635, Switzerland
Abstract

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

Indexed ByEI
Document Type会议论文
Identifierhttp://ir.xjipc.cas.cn/handle/365002/3621
Collection材料物理与化学研究室
Recommended Citation
GB/T 7714
ZhangHui Min,GuanFang,ChangAi Min,et al. Preparation and characterization of NTC NiMn2O4-La1-xCaxMnO3 (0&lex&le0.3) composite ceramics[C]. Trans Tech Publications Ltd, Kreuzstrasse 10, Zurich-Durnten, CH-8635, Switzerland,2013:78-83.
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