Structural, magnetic and dielectric properties of Yb3+ doped BaCo-X hexagonal nanoferrites

New X-type hexagonal Yb3+-doped Ba2Co2Fe28O46 ferrites were prepared via wet chemical route. The Yb3+-contents in Ba(2)Co(2)YbxFe(28-x)O(46) were kept from 0.00 mol to 0.15 mol in six different compositions. XRD patterns in two theta range 15-70 confirmed the X-type hexagonal ferrites with crystallite size < 40 nm. Predicted appropriate variations in lattice parameters and cell volume confirmed the successful substitution of Fe3+ ions with Yb+3 ions at octahedral sites. The bulk density (D-b), X-ray density (D-x) and porosity (P) were also significantly varied by increased Yb3+ contents. The fourier transform infrared (FTIR) spectra exhibited the metal-oxygen (Fe-O) stretching vibrational band which further confirmed the successful preparation of hexagonal ferrites. The FTIR band at wave number 1029 cm(-1) indicated the presence of cobalt in the pure and un-doped sample which is the characteristic feature of cobalt ferrite. The magnetic measurements carried out in the range -10000 to 10,000 oersted (Oe) at room temperature indicated the increased coercivity (H-c) from 236.4 to 532.7 Oe by increased Yb3+ contents. However the saturation magnetization (M-s) was decreased from 27.4 to 8.6 emu/g) and retentivity (M-r) decreased from 5.2 to 3 emu/g. The decreased Ms and Mr values are attributed to the modified cationic distribution and re-distribution of cations. The squareness values < 0.5 suggested the multi-magnetic domain structure. The dielectric parameters i.e. dielectric constant, dielectric loss and tangent loss were measured in the frequency range of 1 x 10(6) to 3 x 10(9) Hz and these parameters showed appropriable variations in high frequency region. The optimized dielectric parameters suggested that these prepared hexagonal ferrites can be used in the fabrication of multilayer chip inductors (MLCI's) circuits. (C) 2016 Elsevier B.V. All rights reserved.