Ferrite compound of the chemical composition SrO/spl middot/nFe/sub 2/O/sub 3/ (2.0<n<6) showed high magnetic properties comparable to that of SrO/spl middot/6Fe/sub 2/O/sub 3/ (M-ferrite). The saturation magnetisation Ms is 50/spl sim/75 emu/g in the range of n=6.0/spl sim/2.0. Coercive force iHc is 2.4 kOe near n=6.0/spl sim/6.5 and n=1.5. Furthermore, SrO/spl middot/nFe/sub 2/O/sub 3/ indicated hexagonal (M-type) orthorhombic and tetragonal phases in the range of n=6.5/spl sim/2.0, 2.0/spl sim/0.5 and less than 0.5, respectively. The fact means that a new magnetic phase is in existence near n=1.0/spl sim/2.0. Also, it is never recognized that the compound of chemical formula 3Sr0/spl middot/2Fe/sub 2/O/sub 3/, which is described in the current phase diagram and have been prevailed for more than two decades, is in existence.
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Kagotani et al. (1995) studied this question.
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