Abstract
The CaMn7O12 double perovskite-like manganite is studied using Mossbauer spectroscopy with 57Fe impurity atoms. The hyperfine parameters of the Mossbauer spectra are found to reflect the specific local structure of this oxide. It is found that the phase transition at T ≈ 90 K is associated with the ordering of the magnetic moments of manganese cations in the octahedral sublattice. The structural phase transition R\(\overline 3 \) ↔ Im\(\overline 3 \) is shown to occur in the temperature interval from 380 to 450 K, where the rhombohedral (R\(\overline 3 \)) and cubic (Im\(\overline 3 \)) phases of the manganite coexist.
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