Abstract: Strontium ferrites with La, Co and Zn substitution were prepared by conventional ceramic method, and the influence of Zn~(2+)on the structure and magnetic properties of hexagonal strontium ferrites had been investigated. The XRD results show that ferrites remain a hexagonal structure with the content of Zn~(2+)increasing, lattice parameter a was gradual increased and c first increased,then decreased with x increasing. SEM results show the grains represented an orderly plate, many of them even were hexagonal shape. The sizes of grains were gradual increased with the increasing content of Zn~(2+). By magnetic properties measurement, Br and Hcj both were 436 mT, 343 kA/m when x=0.15. It demonstrates the antiparallel magnetic moments can be effective decreased and saturation magnetization is increased, so the magnetic properties have been improved.

Key words: Strontium ferrites with La, Co and Zn substitution were prepared by conventional ceramic method, and the influence of Zn~(2+)on the structure and magnetic properties of hexagonal strontium ferrites had been investigated. The XRD results show that ferrites remain a hexagonal structure with the content of Zn~(2+)increasing, lattice parameter a was gradual increased and c first increased,then decreased with x increasing. SEM results show the grains represented an orderly plate, many of them even were hexagonal shape. The sizes of grains were gradual increased with the increasing content of Zn~(2+). By magnetic properties measurement, Br and Hcj both were 436 mT, 343 kA/m when x=0.15. It demonstrates the antiparallel magnetic moments can be effective decreased and saturation magnetization is increased, so the magnetic properties have been improved.