Abstract
The Fe 2O 3(Al 2O 3) x(CuO) 1-x system (0.0≤x≤0.8) has been investigated in the range of 0.0≤x≤0.8 by means of X-ray diffractometry and Mössbauer spectroscopy. The structure of the system is a cubic spinel type although it is strongly nonstoichiometric in the entire composition range. A pair of well defined Zeeman splittings from Fe 3+ ions at A- and B-sites for x=0.0, and three Zeeman lines from Fe 3+ ions at A- and B-sites and Fe 2+ ions at B-sites for x ranging from 0.2 to 0.8 have been observed at room temperature. The observed hyperfine fields and Neel temperatures could be explained on the basis of the superexchange and supertransferred hyperfine interactions.
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