Mn_1.29Fe_1.71O₄フェライトの焼結と磁気特性におよぼす弗化物の添加効果

抄録

Effects of addition of fluorides, MnF₂ and FeF₃⋅3H₂O, on the sintering of Mn_1.29Fe_1.71O₄ ferrite compact and magnetic properties of the fired ferrite body were studied by measuring the fired bulk density, grain size, B-H curve (magnetic hysteresis curve), ferrimagnetic Curie temperature, saturation magnetization and crystal lattice constant. The results obtained are as follows.
1) By addition of the fluorides, grain size and bulk density of the fired ferrite body became larger.
2) No fluorine was contained in the fired ferrite body, since all the amount of fluorine had been liberated during the firing.
3) No ferrimagnetic Curie temperature, saturation magnetization and crystal lattice constant being intrinsic properties of ferrite were changed with addition of the fluorides.
4) By addition of the fluorides, magnetic hysteresis characteristics depending on the compactness of the ferrite materials were changed, i.e., magnetic flux density became larger and coercive force became smaller.