The 57Fe Mössbauer spectrum in an applied 37 kOe field is interpreted in terms of three superimposed six-line patterns corresponding to at least three distinct species of Fe ions. While the observed hyperfine fields and isomer shifts of Fe3+ at A and B are consistent with the trends in ferrite spinels, the apparent Fe2+ values are rather unusual.
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Evans et al. (1969) studied this question.
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