Cerâmica | |
Structural and magnetic investigation of Ca2MnReO6 doped with Ce | |
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】
CC BY-NC
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