Effects of Dy on structural, dielectric and magnetic properties of Ni-Sr-Y co-precipitated hexaferrites

Dysprosium (Dy) doped Y-type strontium hexa ferrites of the following composition Ni2Sr2DYxFe12-xO22 where (x = 0.00, 0.05, 0.10, 0.15, 0.20, 0.25) were prepared through co-precipitation process. Phase analysis of the investigated samples was carried out by characterizing through (XRD) X-ray diffraction which confirmed the pure phase of Y-type hexaferrites. Dysprosium ion doping influenced lattice parameters i.e. lattice constants (a, c), crystallite size, (c/a) ratio, cell volume and porosity. The calculated crystallite size was in the range of 88-159 nm. FTIR plots showed that the characteristics bonds of Ni2Sr2DYxFe12-xO22 are appreciably influenced by the incorporation of Dy contents. The results of dielectric parameters revealed that dielectric constant, dielectric loss, tanloss were decreased with an increase in frequency. At 6.0 x 10(8) Hz, dielectric constant decreased from 5.55 to 3.69 with increasing Dy concentration. Owing to Maxwell-wagner type relaxation, the decrease in dielectric constant was noticed at higher frequency. The smaller dielectric constants and dielectric losses make these materials suitable for their applications in microwave devices fabrication.