7. Effect of Transition Metal Ions on the Conductivity and Stability of Stabilised Zirconia

  1. Narottam P. Bansal,
  2. Andrew Wereszczak and
  3. Edgar Lara-Curzio
  1. D. Lybye and
  2. M. Mogensen

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291337.ch7

Advances in Solid Oxide Fuel Cells II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 4

Advances in Solid Oxide Fuel Cells II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 4

How to Cite

Lybye, D. and Mogensen, M. (2006) Effect of Transition Metal Ions on the Conductivity and Stability of Stabilised Zirconia, in Advances in Solid Oxide Fuel Cells II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 4 (eds N. P. Bansal, A. Wereszczak and E. Lara-Curzio), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291337.ch7

Author Information

  1. Materials Research Department, Risø National Laboratory, P. O. BOX 49, DK-4000 Roskilde, Denmark

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2006

ISBN Information

Print ISBN: 9780470080542

Online ISBN: 9780470291337

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Keywords:

  • zirconia;
  • electrolytes;
  • parameters;
  • polyhedral;
  • parameter

Summary

Zirconia compounds stabilised with rare-earth metal oxides like yttria, ytterbia and scandia are known to be good oxide ion conductors suitable as electrolyte material in solid oxide fuel cells. However, stabilised zirconia with high oxide ion conductivity is often only metastable at fuel cell operation temperatures and changes in temperature or oxygen partial pressure together with long-term operation are seen to induce partial destabilisation and even phase changes. In order to avoid these effects co-doping has proven helpful. Based on experimental data available in literature, we discus the effect of co-doping with smaller transition metal ions such as Ti-, Fe-and Mn-ions. Many of the ionic radii of the transition metal ions are too small compared to the host lattice ionic radius of zirconium. Here we explore the effect of a) the small ionic radii compared to the large ionic radii of the host lattice and b) the preferred six coordination compared to the desired eight-fold coordination of the fluorite structure. Particular interest is paid to the solubility of the transition metal ions and to the conductivity of the resulting material.

Indium is not a transition metal but due to the size of the ionic radius of the metal, the effect of doping with In is also explored.