57 Fe Mössbauer study on the ordered double perovskite A 2 FeReO 6 (A = Ca, Sr) has been conducted. Fe ions are in 2.5+ states that correspond to the hybridized state of 3d t 2g down-spin electrons with Re 5+ 5d t 2g down-spin electrons. The orbital effect due to this seems to be absent. On the metal–insulator transition of Ca 2 FeReO 6 specimen, slight change of the electronic state toward Fe 3+ state is recognized. The quadrupole interaction is well explained by a point charge model, which may suggest that while the electrons of Re are itinerant, those of Fe stay rather localized.
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Nakamura et al. (2003) studied this question.