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

Chunhua Zhao, Biyun Wang, Aloysius J.A. Winnubst, Pinghua Yang, Chusheng Chen

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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
Original languageUndefined
Pages (from-to)35-40
JournalJournal of the European Ceramic Society
Volume28
Issue number1
DOIs
Publication statusPublished - 2008

Keywords

  • IR-71884
  • METIS-250430

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