Structural, magnetic properties of nickel-substituted strontium W-type ferrites

Nickel substituted W-type strontium ferrites Sr0.9Ce0.1Zn2-xNixFe16O27 (x=0.0, 0.2, 0.4, 0.6, 0.8 and 1.0) were prepared by a ceramic method. The specimens exhibited a single-phase W-type structure when the Ni content (x) is 0 <= x <= 1. With the increasing content of nickel dopant, the particles exhibited a hexagonal plate-like shape. The saturation magnetization and remanent magnetization increased x from 0.0 to 0.6, then decreased with x > 0.6. The coercivity of specimens increased gradually for x <= 0.2 and then began to decrease from x = 0.3; the coercivity shows a downward trend with the Ni content continuing to increase. Subsequently, as the Ni content increases, there is a downward trend compared to the unsubstituted specimens.