Abstract
Specific gravity, crystal lattice constant, saturation magnetization and ferrimagnetic Curie temperature were measured to clarify the type of point defects in the oxygen-excess manganese-magnesium ferrite containing a slight amount of copper (Cu 0·08 6 Mg 0·21 4 Mn 0·98 6 Fe 1·71 4 O 4+δ). Of those properties, crystal lattice constant and saturation magnetization decrease, while ferrimagnetic Curie temperature increases, as the oxygen content in the ferrite increases. Specific gravity is almost independent upon the oxygen content. From the quantitative analyses of these characteristics, it can be concluded that the point defects in oxygen-excess manganese-magnesium ferrite are of cation vacancies on its B-sites (octahedral sites).
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