Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1478608 | Journal of the European Ceramic Society | 2006 | 5 Pages |
Abstract
Series of FexMn2.34−xNi0.66O4 (0 < x < 1) NTC ceramics were prepared by the Pechini method. Resistivity, thermal constant (B) and aging values were measured. It was found that the resistivity increased with increasing iron content x. The B value however first decreased with increasing x in the range of x < 0.6 and then increased with further increase in x. Aging reached a maximum in the middle range (x = 0.4–0.6) of iron content. X-ray diffraction (XRD) and infrared analysis were used to determine the distribution of Fe3+ ions. The Fe3+ ions were found to occupy both A- and B-site when x < 0.6 and then go to B-site when x > 0.6. An redistribution of the Fe3+ ions between A- and B-site was related to the aging of the NTC thermistor.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Zhongbing Wang, Chunhua Zhao, Pinghua Yang, A.J.A. Winnubst, Chusheng Chen,