Very fine strontium powder for magnetic ceramics

The possibility of preparing very fine strontium ferrite powder with application of preliminary mechanical treatment in a rolling mill is studied. It is established that powder preparation time is shortened by a factor of 2.5–3 and the amount of coarse particles is reduced. The method used for preparing very fine powder makes it possible to control the size of particles and their specific surface. The powder may be used for preparing permanent magnets with a high specific magnetizability (above 32 kJ/m3).