Cobalt and tin substituted barium ferrites: the K and R phases

Crystals of different barium ferrite phases (M, K, and R phases) were grown by slow cooling and the top seeded solution growth technique, using the (0 .4Na(2)O-0.6B(2)O(3))-BaO-(4.5Fe(2)O(3) + 1.5CoSnO(3)) system. It has been demonstrated that different ferrite phases, e.g., the K and R phases, may c oexist in the same crystal with an interface that is free from observable m isfit dislocations and amorphous zones. The magnetization of these two phas es, measured with an applied magnetic field parallel to the crystallographi c c axis, had a paramagnetic behavior. (C) 2000 American Institute of Physi cs. [S0021-8979(00)08903-9].