Skip to main content
SpringerLink
Log in

Order-disorder phenomena in A2B2O7 pyrochlore oxides

  • Research Summary
  • Alloy Science
  • Published:
JOM Aims and scope Submit manuscript

Abstract

The size difference between the cation species that occupy the A and B sites is believed to be the driving force for ordering in the pyrochlore superstructure. Indeed, substituting a larger tetravalent cation in solid solution in the B site or a smaller trivalent cation in the A site progressively drives the structure to a disordered state in several systems, but not in cases where there is a strong covalent component to the bonding. Similar disordering behavior is found when the phases are heated. Pyrochlore is the only oxide in which simultaneous order-disorder transformations take place in the anion and cation arrays in the structure. Disorder evolves at independent rates in the cation and anion arrays despite the Coulombic interactions between them.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. M.A. Subramanian, G. Aravamudan, and G.V. Subba Rao, Prog. Solid State Chemistry, 15 (1983), pp. 55–143.

    Article  CAS  Google Scholar 

  2. D. Michel, M. Perezy Jorba, and R. Collongues, Mater. Res. Bull., 9 (1974), pp. 1457–1468.

    Article  CAS  Google Scholar 

  3. S. Meilicke and S. Haile, Mater. Res. Soc. Symp. Proc., 135 (1995), pp. 55–60.

    Google Scholar 

  4. B.J. Wuensch and K.W. Eberman, Properties of Complex Inorganic Solids, Vol. II, ed. A. Meike et al. (Dordrecht, Netherlands: Kluwer Academic/Plenum Publishers, 2000).

    Google Scholar 

  5. P.K. Moon and H.L. Tuller, Solid State Ionics, 28–30 (1988), pp. 470–474.

    Article  Google Scholar 

  6. P.K. Moon and H.L. Tuller, Mater. Res. Soc. Symp. Proc., 135 (1989), pp. 149–163.

    CAS  Google Scholar 

  7. M.P. Pechini, U.S. patent 3,330,697 (1967).

  8. H.M. Rietveld, J. Appl. Cryst., 2 (1971), pp. 65–71.

    Article  Google Scholar 

  9. B.J. Wuensch et al., Solid State Ionics, 129 (2000), pp. 111–133.

    Article  CAS  Google Scholar 

  10. C. Heremans et al., J. Solid State Chem., 117 (1995), pp. 108–121.

    Article  CAS  Google Scholar 

  11. E.M. Ku, E.M.E. Yeo, and B.J. Wuensch, Mater. Res. Soc. Symp. Proc., 547 (1999), pp. 327–332.

    CAS  Google Scholar 

  12. H.L. Tuller, High Temperature Electrochemistry: Ceramics and Metals, ed. F.W. Poulsen et al. (Roskilde, Denmark: Riso National Laboratory, 1996), pp. 139–153.

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. the Department of Materials Science and Engineering, Massachusetts Institute of Technology, USA

    Bernhardt J. Wuensch (a professor of ceramics)

  2. the 3M Center, USA

    Kevin W. Eberman

Authors
  1. Bernhardt J. Wuensch
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Kevin W. Eberman
    View author publications

    You can also search for this author in PubMed Google Scholar

Additional information

For more information, contact B.J. Wuensch, Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307; fax (617) 253-5827; e-mail wuensch@MIT.edu.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Wuensch, B.J., Eberman, K.W. Order-disorder phenomena in A2B2O7 pyrochlore oxides. JOM 52, 19–21 (2000). https://doi.org/10.1007/s11837-000-0155-4

Download citation

  • Issue Date:

  • DOI: https://doi.org/10.1007/s11837-000-0155-4

Keywords

Search

Navigation