Synthesis of a new U-type hexaferrite Ba₄Cu₂Fe₃₆O₆₀

抄録

  We have investigated the synthesis conditions and the magnetic properties of a new U-type hexaferrite, Ba₄Cu₂Fe₃₆O₆₀(Cu2U). The samples were prepared by a conventional ceramic method. We used BaCO₃, CuO, and α-Fe₂O₃ as starting materials. They were mixed in a desired proportion, Ba_4+xCu₂Fe₃₆O₆₀, and synthesized at 1050℃. We found that a 10 at.% excess of barium compared with the stoichiometric composition, is the best condition for the synthesis of the U-type hexaferrite. It is also found that the saturation magnetization at room temperature is 53.5 emu/g, and the Curie temperature is about 420℃.