Effects of Cu and Zn co-doping on the electrical properties of Ni0.5Mn2.5O4 NTC ceramics

Zhao, Chunhua and Wang, Biyun and Yang, Pinghua and Winnubst, Louis and Chen, Chusheng (2008) Effects of Cu and Zn co-doping on the electrical properties of Ni0.5Mn2.5O4 NTC ceramics. Journal of the European Ceramic Society, 28 (1). pp. 35-40. ISSN 0955-2219

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Abstract:	The effects of Cu and Zn co-doping on Ni–Mn–O spinel-structured NTC ceramics were investigated. Dense Cu and Zn co-doped Ni0.5Mn2.5O4 spinel-structured ceramics were prepared from mixed oxalate-derived powders. XPS analysis revealed that in the co-doped material CuxZn1.0Ni0.5Mn1.5−xO4, the majority of Cu ions resided at the B-sites due to the almost exclusive occupation of Zn ions at the A-sites, but in the material doped with Cu alone, Cu ions were situated at both A- and B-sites. The co-doped material exhibited a significant decrease in electrical resistivity without much decrease in the thermal constant. In comparison with the material doped with Cu alone, the co-doped material also showed much improved electrical stability upon annealing at 150 °C in air, which is attributed to its stable distribution of cations in the spinel
Item Type:	Article
Copyright:	Elsevier
Faculty:	Science and Technology (TNW)
Research Group:	Inorganic Membranes (IM)
Link to this item:	http://purl.utwente.nl/publications/71884
Official URL:	http://dx.doi.org/10.1016/j.jeurceramsoc.2007.06.007
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