IONIC CONFIGURATION OF COPPER FERRIMANGANITES CU0.5MNXFE2.5-XO4

Mössbauer spectrometry, neutron diffraction, XANES, and XPS have led to the determination of the cation distributions of the system Cu0.5MnxFe2.5-xO4 (0≤x≤1.5). The three cations are present in both tetrahedral and octahedral sites, and the relative number of Fe ions on A- and B-sites remains nearly constant in the whole range of x. It appears that for x≤0.5 manganese is divalent and copper is in its two oxidation states. For x>0.5 copper and iron are respectively divalent and trivalent; the manganese is in +2 and +3 oxydation states. © 1992 Academic Press, Inc.