X-ray diffraction and infrared spectra studies of FexMn2.34−xNi0.66O4 (0 < x < 1) NTC ceramics

Wang, Zhongbing and Zhao, Chunhua and Yang, Pinghua and Winnubst, A.J.A. and Chen, Chusheng (2006) X-ray diffraction and infrared spectra studies of FexMn2.34−xNi0.66O4 (0 < x < 1) NTC ceramics. Journal of the European Ceramic Society, 26 (1). pp. 2833-2837. ISSN 0955-2219

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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.
Item Type:	Article
Copyright:	Elsevier
Faculty:	Science and Technology (TNW)
Research Group:	Inorganic Membranes (IM)
Link to this item:	http://purl.utwente.nl/publications/71895
Official URL:	http://dx.doi.org/10.1016/j.jeurceramsoc.2005.05.007
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