Advertisement

Ionics

, Volume 10, Issue 5–6, pp 353–357 | Cite as

Synthesis and electrical characterisation of the apatite-type oxide ion conductors Nd9.33+xSi6-yGayO26+z

  • J. R. Tolchard
  • J. E. H. Sansom
  • M. S. Islam
  • P. R. SlaterEmail author
Article

Abstract

Apatite-type oxides have been attracting interest as a new class of oxide ion conductors. In this paper we examine the effect of Ga doping on the conductivity of the apatite silicate system, Nd9.33+xSi6O26+3x/2 and compare the results to those reported for similar doping studies in La9.33+xSi6O26+3x/2. The highest conductivities are observed for samples containing oxygen excess, which is in agreement with previous reports that interstitial oxide ions are important for high oxide ion conduction in these materials. For oxygen stoichiometric materials, i.e. Nd9.33+x/3Si6-xGaxO26, the Ga doping results in a significant increase in activation energy and a consequent lowering of the low temperature conductivity. This is contrary to results previously reported for the La containing analogues, which showed an enhancement of conductivity on Ga doping up to x=1.5. Possible explanations for the differences between the two systems are discussed.

Keywords

Silicate Activation Energy Apatite High Oxide Oxygen Excess 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

5. References

  1. [1]
    S. Nakayama, H. Aono, Y. Sadaoka, Chem. Lett. 431 (1995).Google Scholar
  2. [2]
    S. Nakayama, M. Sakamoto, J. Eur. Ceram. Soc.18, 1413 (1998).CrossRefGoogle Scholar
  3. [3]
    S. Nakayama, M. Sakamoto, M. Higuchi, K. Kodaira, M. Sato, S. Kakita, T. Suzuki, K. Itoh, J. Eur. Ceram. Soc.19, 507 (1999).CrossRefGoogle Scholar
  4. [4]
    H. Arikawa, H. Nishiguchi, T. Ishihara, Y. Takita, Solid State Ionics136–137, 31 (2000).Google Scholar
  5. [5]
    J.E.H. Sansom, L. Hildebrandt, P.R. Slater, Ionics8,155 (2002).Google Scholar
  6. [6]
    J.E.H. Sansom and P.R. Slater, Solid State Phenomena90–91,189, (2003).Google Scholar
  7. [7]
    S. Nakayama and M. Sakamoto, J. Mater. Sci. Lett.20, 1627 (2001).Google Scholar
  8. [8]
    P. Berastegui, S. Hull, F.J. Garcia Garcia and J. Grins, J. Solid State Chem.168, 294 (2002).CrossRefGoogle Scholar
  9. [9]
    P.R. Slater, J.E.H.Sansom, J.R. Tolchard, and M.S. Islam, Proc. MRS Conf. Solid State Ionics-2002, 567 (2003).Google Scholar
  10. [10]
    L. Leon-Reina, M.E. Martin-Sedeno, E.R. Losilla, A. Caberza, M. Martinez-Lara, S. Bruque, F.M.B. Marques, D.V. Sheptvakov, M.A.G. Aranda, Chem. Mater.15, 2099 (2003).CrossRefGoogle Scholar
  11. [11]
    J.R. Tolchard, J.E.H. Sansom, P.R. Slater, M.S. Islam, J. Solid State Electrochem.8, 668 (2004).CrossRefGoogle Scholar
  12. [12]
    S. Tao, J.T.S. Irvine, Mater. Res. Bull.36,1245 (2001).CrossRefGoogle Scholar
  13. [13]
    J.E.H. Sansom, D. Richings, P.R. Slater, Solid State Ionics139, 205 (2001).CrossRefGoogle Scholar
  14. [14]
    E.J. Abram, D.C. Sinclair, A.R. West, J. Mater. Chem.11, 1978 (2001).CrossRefGoogle Scholar
  15. [15]
    J. McFarlane, S. Barth, M. Swaffer, J.E.H. Sansom, P.R. Slater, Ionics8, 149 (2002).Google Scholar
  16. [16]
    M.S. Islam, J.R. Tolchard, P.R. Slater, Chem. Commun. 1486 (2003).Google Scholar
  17. [17]
    J.R. Tolchard, M.S. Islam, P.R. Slater, J. Mater. Chem.13, 1956 (2003).CrossRefGoogle Scholar
  18. [18]
    J.E.H. Sansom and P.R. Slater, Proc. 5th Euro SOFC forum2, 627 (2002).Google Scholar
  19. [19]
    P.R. Slater and J.E.H. Sansom, Solid State Phenomena90–91, 195 (2003).Google Scholar
  20. [20]
    J.R. Tolchard, J.E.H. Sansom, P.R. Slater and M.S. Islam, Solid State Ionics167, 17 (2004).Google Scholar
  21. [21]
    L. Leon-Reina, E.R. Losilla, M. Martinez-Lara, S. Bruque, M.A.G. Aranda, J. Mater. Chem.14, 1142 (2004).Google Scholar
  22. [22]
    A.L. Shaula, V.V. Kharton, M.V. Patrakeev, J.C. Waerenborgh, D.P. Rojas, N.P. Vyshatko, E.V. Tsipis, A.A. Yaremchenko, F.M.B. Marques, Mater. Res. Bull.39, 763 (2004).CrossRefGoogle Scholar
  23. [23]
    A.A. Yaremchenko, A.L. Shaula, V.V. Kharton, J.C. Waerenborgh, D.P. Rojas, M.V. Patrakeev, F.M.B. Marques, Solid State Ionics171, 51 (2004).CrossRefGoogle Scholar
  24. [24]
    A. Najib, J.E.H. Sansom, J.R. Tolchard, M.S. Islam, P.R. Slater, Dalton Trans. 19,3106 (2004).Google Scholar
  25. [25]
    J.R. Tolchard, M.S. Islam, P.R. Slater, manuscript in preparation.Google Scholar

Copyright information

© IfI - Institute for Ionics 2004

Authors and Affiliations

  • J. R. Tolchard
    • 1
  • J. E. H. Sansom
    • 1
  • M. S. Islam
    • 1
  • P. R. Slater
    • 1
    Email author
  1. 1.Chemistry, SBMSUniversity of SurreyGuildfordUK

Personalised recommendations