期刊
MICROELECTRONIC ENGINEERING
卷 88, 期 9, 页码 2934-2940出版社
ELSEVIER
DOI: 10.1016/j.mee.2011.04.023
关键词
Fe ion; Doped; Co-precipitation method; NTC ceramic material; Electrical properties
资金
- National Natural Science Foundation of China [50902148]
- K.C. Wong Education Foundation, Hong Kong
Based on spinel-type semiconducting electroceramics, negative temperature coefficient (NTC) thermistor materials, Ni0.9Co0.8Mn1.3-xFexO4 (0 <= x <= 0.7), with different compositions were synthesized by a co-precipitation method. The optimal pH value and the influence of Fe3+ doping during the synthesis processing were discussed. As-prepared Ni0.9Co0.8Mn1.3-xFexO4 materials were characterized by DT/TGA, XRD, FTIR, SEM, electrical measurement and impendance analysis. It was found that, as the Fe doping content in the Ni0.9Co0.8Mn1.3-xFexO4 samples increased, both the grain size and the density decreased. The as-sintered Ni0.9Co0.8Mn1.3-xFexO4 samples presented a single-phase cubic spinel structure. The impendance diagram indicated that the grain boundary resistance was dominant in the overall impendance of Ni0.9Co0.8Mn1.3-xFexO4 NTC ceramic materials. The value of rho(25). B-25/50, slope and activation energy for the samples Ni0.9Co0.8Mn1.3-xFexO4 sintered at 1200 degrees C were in the range of 453.1-2411 Omega cm, 3103-3355 K, 3.27325-3.43149 and 0.28207-0.29325 eV, respectively. This suggests that the electrical properties can be adjusted to desired values by controlling the Fe3+ ion doping content. (C) 2011 Elsevier B.V. All rights reserved.
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