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.
|Journal||Journal of the European Ceramic Society|
|Publication status||Published - 2006|
Wang, Z., Wang, Z., Zhao, C., Yang, P., Winnubst, A. J. A., & Chen, C. (2006). X-ray diffraction and infrared studies of FexMn2.34-xNi0.66O4 (0. Journal of the European Ceramic Society, 26(13), 2833-2837. https://doi.org/10.1016/j.jeurceramsoc.2005.05.007