Structural and magnetic investigation of Ca2MnReO6 doped with Ce

Cerâmica

J. B. Depianti²  M. T. D. Orlando²  A. S. Cavichini²  H. P. S. Corrêa¹  V. A. Rodrigues²  J. L. Passamai²  E. L. O Piedade²  H. Belich¹  E. F. Medeiros²  F. C. L. De Melo¹ 

[1] ,Universidade Federal do Espírito SantoVitória ES

关键词: Ce-doping;    double perovskite;    XANES;    pressure;    dopagem com cério;    dupla perovskita;    XANES;    pressão;   

DOI  :  10.1590/S0366-69132013000200011

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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