| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1597127 | Solid State Communications | 2006 | 5 Pages |
Abstract
We studied by Mössbauer spectroscopy the Na0.82CoO2 compound using 1% 57Fe as a local probe which substitutes for the Co ions. Mössbauer spectra at T=300Â K revealed two sites which correspond to Fe3+ and Fe4+. The existence of two distinct values of the quadrupole splitting instead of a continuous distribution should be related with the charge ordering of Co+3, Co+4 ions and ion ordering of Na(1) and Na(2). Below T=10Â K part of the spectrum area, corresponding to Fe4+ and all of Fe3+, displays broad magnetically split spectra arising either from short-range magnetic correlations or from slow electronic spin relaxation.
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Authors
M. Pissas, V. Psycharis, D. Stamopoulos, G. Papavassiliou, Y. Sanakis, A. Simopoulos,