Lattice Constants and Compositions of Manganese‐Bearing Ferrites

When manganese‐bearing ferrites (Mn x Fe 3‐ x O 4‐delta , with x = 0.17‐1.09) were prepared in the present study via a solid‐state reaction, manganese ions were incorporated into the lattice sites of the ferrites in the divalent state. The lattice constant ( a 0 ) of those ferrites increased linearly as the manganese composition x increased. A ferrite with x = 1.28 contained manganese ions with a valence state higher than 3+; however, no further increase in a 0 occurred at valences higher than 2+.