Abstract
Coprecipitation of manganese and iron followed by calcination at temperatures below 500°C results in a new structural phase for the Mn−Fe−O system: a non-stoichiometric spinel with, in every three unit cells, one metal atom missing. About 57% of the iron in this spinel has the composition γMnFeO3 which is paramagnetic at room temperature. The remaining 43% of the iron has the composition MnyFe2-yO3 with y∼0.16 which is magnetic at room temperature.
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