Magnetic properties ofX‐type Ba2Me2Fe28O46(Me=Fe, Co, and Mn) hexagonal ferrites

摘要

Polycrystalline samples ofX‐type Ba2Me2Fe28O46(Me2‐X, Me=Fe, Co, and Mn) hexagonal ferrite have been prepared by the classic ceramic method. Low‐temperature magnetic properties, Curie temperatures, and distribution of divalent cations were studied. The substitution of Fe2+ions with Co2+and Mn2+ions causes a decrease of the spontaneous moment mgr; and the Curie temperatureTcofX‐type hexaferrites. The lower mgr; andTcof Co2‐Xhexaferrite originate from the smaller magnetic moment of Co2+ions. In the case of Mn2‐X, the lower mgr; may be due to the valence state of Mn and the lowerTcmay be caused by the fact that the space distribution of 3d electrons of Mn is different from that of Fe. In the Co2‐Xand Fe2‐Xcompounds the Co2+and Fe2+ions enter the octahedral sites of spinelSblocks.