Structural and magnetic properties of Sr1a?’xLaxFe12a?’x(Cu0.5Co0.5)xO19 hexaferrites prepared by the solid-state reaction method

摘要

Hexaferrite Sr_1a?’xLa_xFe_12a?’x(Cu_0.5Co_0.5)_xO₁₉ (0 a‰¤ e?‘￥ a‰¤ 0.50) magnetic powders and magnets were synthesized by the solid-state reaction method. The phase compositions of magnetic powders were investigated by X-ray diffraction. The single magnetoplumbite phase is obtained in magnetic powders with e?‘￥ from 0 to 0.40. At e?‘￥ = 0.50, CoFe₂O₄, and e???-Fe₂O₃ were observed. The morphology of the materials was characterized by a field-emission scanning electron microscopy. The particles were hexagonal platelets. Magnetic properties of the materials were measured by a permanent magnetic measure equipment. The remanence of the materials increases with e?‘￥ from 0 to 0.50. However, the intrinsic coercivity and magnetic induction coercivity of the materials increase with e?‘￥ from 0 to 0.15, and decreases when e?‘￥ varies from 0.15 to 0.50. Accordingly, the maximum energy product of the materials first increases with e?‘￥ from 0 to 0.35, and then decreases when e?‘￥ exceeds 0.35.