Preparation and magnetic properties of Ni–Zr doped barium strontium hexaferrite

Abstract

M-type Hexaferrites B 0.5 Sr 0.5 Fe 12-2x Ni x Zr x O 19 were synthesized and investigated. The XRD patterns show single phase of the magnetoplumbite barium strontium ferrite and no other phases were present. The samples exhibit well defined crystallization; all of them are hexagonal platelet grains. As the substitution level increased from x = 0.2 to 0.8 mol%, the grains are agglomerated and the average diameter increased. This suggests that Ni-Zr substitution increases the grain size, as observed in the FE-SEM micrographs. The results of magnetic measurement revealed that M s of barium strontium hexaferrite increased when the value of x increased from 0 to 0.4 mol% and then decreased with the increasing Ni-Zr content. The H c decreases remarkably with increasing Ni and Zr ions content. Hard magnetic material is converted into soft magnetic material when the substitution level is increased from 0.2 to 0.8 mol%. In particular, Ba 0.5 Sr 0.5 Fe 12-2x Ni x Zr x O 19 with x = 0.2, 0.4, 0.6, 0.8 mol% has suitable magnetic characteristics with particle size small enough for highdensity magnetic recording applications.

Influence of Substituted Elements on Reflection Loss of Ba-Ferrite Nanoparticle

“…Thus, the coercive force decreases was affected by the magnetic moments of the substitution ions. This results means that the substituted elements influenced the saturation magnetization and the coercive force [3][4][5][6]. The reflection loss of XTiM is shown in Fig.…”

“…The magnetic properties of all samples are shown in Fig. 4 [4]. Thus, the coercive force decreases was affected by the magnetic moments of the substitution ions.…”

“…BaFe 12 O 19 has wave absorption band of several gigahertz, as it has high coercive force and high magnetic anisotropy [2] by the Fe 3+ ion on the 2b, 4f 2 site in its magnetoplumbite structure. ion on the ferrite structure [3][4][5][6][7][8][9][10][11]. In this study, we investigated wave absorption range change of of BaFe 10 XTiO 19 (XTiM, X = Co, Cu, Ni, Zn) nanopowder according to change of magnetization easy axis by combination of divalent element (Co, Cu, Ni, Zn) and tetravalent element (Ti).…”

Structural and magnetic properties of M–Ti (M = Ni or Zn) co-substituted M-type barium ferrite by a novel sintering process

“…BaFe 12 O 19 , M-type barium ferrite is a permanent magnetic material. Since its discovery in the 1950s there has been an increasing degree of interest in ferrite, which is still growing today [1,2].…”

“…Ion substitution was considered as the most effective technique of adjusting properties. In BaFe 12 O 19 , ions could substitute Ba 2? [6,7] or Fe 3?…”