Abstract
The effects of MgF2 addition on the formation of sintered ferrite compacts were studied. They were prepared by mixing and sintering at 1300°C for 2h in air the following compositions. MgO; 50-x, MgF2; x, Fe2O3; 50mol% (x=0, 1, 4, 7, 12 and 20). During sintering almost of fluorine sublimed, its amount remained in the ferrite compacts was small, and seems to exist in ferrite lattice. A large amount of MgF2 addition (x≥12) resulted to precipitate the foreign phase on the surface of the ferrite compacts in the form of such as MgO. Sinterability decreased practically with increasing amount of MgF2. This decrease was attributed to a presumable decrease of cation vacancy concentration by addition of MgF2.The effects of MgF2 addition on magnetic properties and crystal lattice constant of magnesium ferrite were studied. Saturation magnetization and crystal lattice constant decreased by addition of MgF2, on the contrary, Curie temperature increased. B-H (magnetic hysteresis) characteristics also changed. Namely, magnetic flux density decreased, while coercive force increased.
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