The valence state of iron in the compounds Ca2FeMoO6, Sr2FeMoO6 Ba2FeMoO6, Ca2FeReO6, Sr2FeReO6, Sr2FeMo1−xW x O6 (x=0.2 and 0.4), and (Sr2−xLax)FeMoO6 (x=0.5 and 0.7), which have been prepared using ceramic and combustion techniques, has been studied using 37Fe Mössbauer spectroscopy. Judging by the isomer shifts and hyperfine fields, intermediate iron oxidation states are found for all these compounds, represented by a 3d5x configuration, where 1<x<5. Here 0.x represents the number of ↓ electrons of Fe(3d) character in the Fe/Mo,W or Fe/Re conduction band.
KeywordsValence State Isomer Shift Hyperfine Field Antisite Defect Mossbauer Spectrometry
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