Physics and Chemistry of Minerals

, Volume 37, Issue 10, pp 761–767

Pressure-induced structural transition in Ln2Zr2O7 (Ln = Ce, Nd, Gd) pyrochlores

  • S. Surblé
  • S. Heathman
  • P. E. Raison
  • D. Bouëxière
  • K. Popa
  • R. Caciuffo
Original Paper

DOI: 10.1007/s00269-010-0374-3

Cite this article as:
Surblé, S., Heathman, S., Raison, P.E. et al. Phys Chem Minerals (2010) 37: 761. doi:10.1007/s00269-010-0374-3

Abstract

The structural behavior under pressure of three lanthanide pyrochlore zirconates Ln2Zr2O7 (Ln3+ = Ce, Nd and Gd) has been investigated by X-ray diffraction up to 50 GPa. For all three compounds, a symmetry reduction from cubic to monoclinic is observed under increasing pressure dependant on a pressure value that increases with the ionic radius of the lanthanide ions, rLn. The cubic and monoclinic phases coexist over a wide pressure range which increases with rLn. The zero-pressure bulk modulus of the cubic phase, B0, and its pressure derivative, B0′, have been determined by fitting the experimental compressibility curves to the Birch–Murnaghan equation of state.

Keywords

Pyrochlore X-ray diffraction High pressure Bulk modulus 

Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • S. Surblé
    • 1
  • S. Heathman
    • 1
  • P. E. Raison
    • 1
  • D. Bouëxière
    • 1
  • K. Popa
    • 2
  • R. Caciuffo
    • 1
  1. 1.Institute for Transuranium ElementsEuropean Commission, Joint Research CentreKarlsruheGermany
  2. 2.Department of Chemistry“Al.I. Cuza” UniversityIasiRomania