Magnetic and mössbauer study of coprecipitated SrNi2Fe16O27 (SrNi2W) and SrCo2Fe16O27 (SrCo2W) hexagonal ferrites

Preparation and magnetic characterization of Co2-W strontium hexaferrites doped with Ni and La

“…3). The observed rise of necessary annealing temperature of Ni-doped samples is in accordance with the reported higher formation temperature of SrNi 2 -W in comparison with SrCo 2 -W ferrite [6].…”

“…M-type), usually written in the typical form: MFe 12 [8][9][10][11]. Several studies have also confirmed this indirect synthesis mechanism of Co 2 -W, Ni 2 -W and La-doped W hexaferrites via solid state reaction among Ba(Sr)Fe 12 O 19 and corresponding spinel phases (usually CoFe 2 O 4 or NiFe 2 O 4 ) at high temperature [6,7,[12][13][14][15]. It is noticed that the success of preparing single phase samples is mainly determined by the chemical kinetics, which highlights the importance of homogeneity and purity of the reaction mixture.…”

“…Particularly, Ba(Sr)Co 2 -W hexagonal ferrites are members of the ferroxplana group with sufficiently high values of permeability and magnetic losses. Moreover Ni or La doping of these compounds tends to modify anisotropy from planar to axial, hence allows tailoring of their magnetic properties, which may result in intermediate substances with a wide range of saturation magnetization and coercivity values [5][6][7].…”

Role of Ce–Mn substitution on structural, electrical and magnetic properties of W-type strontium hexaferrites

“…; Me 2+ = Zn, Co, Ni, Mg, Mn, etc.) due to its better magnetic properties than those of other hexagonal ferrites [4]. These hexaferrite materials with a narrow size distribution are promising enough for potential industrial applications due to their high coercivity and saturation magnetization [5].…”

Electromagnetic properties of Ni and La doped strontium hexaferrites in the microwave region

“…Hence, polycrystalline samples of SrCo 2 -W and Ba(Sr)Ni 2 -W were separately investigated and the anisotropy fields H Â and H a were measured to be 2.8 kOe [30] and 11.8-14.9 kOe [30][31][32][33], respectively. Nevertheless, there are no directly comparable values of the in-plane anisotropy field H for Ba(Sr)Co 2 -W ferrite or any information at all about the anisotropy field values of the La doped Ba(Sr)Co 2 -W ferrite reported in the literature.…”