Cerâmica (Jun 2013)

Structural and magnetic investigation of Ca2MnReO6 doped with Ce

  • J. B. Depianti,
  • M. T. D. Orlando,
  • A. S. Cavichini,
  • H. P. S. Corrêa,
  • V. A. Rodrigues,
  • J. L. Passamai,
  • E. L. O Piedade,
  • H. Belich,
  • E. F. Medeiros,
  • F. C. L. de Melo

DOI
https://doi.org/10.1590/S0366-69132013000200011
Journal volume & issue
Vol. 59, no. 350
pp. 262 – 268

Abstract

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We have studied the properties of Ce doping in Ca-site of Ca2MnReO6 double perovskite up to 10%. These compounds have presented a monoclinic cell with P2(1)/n space group. A small increase of lattice parameters in doped sample were observed through Rietveld refinement of X-ray diffraction pattern. The spectra at the Mn K-edge and Re L3-edge showed a mixed valence for Mn and Re in both samples. We do not observed any variation on Mn K-edge valence in XANES measurements under pressure. However a change was observed for Re L3-edge as a function of applied pressure. The Ce-doped sample showed a magnetic geometric frustration and a small decrease of the temperature frustration as compared with Ca2MnReO6 sample. The decrease of temperature frustration can be related to the MnO6 and ReO6 octahedral distortion.

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