Investigation of crystal structure, dielectric response and magnetic properties of Tb3+ substituted Co2 Y-type barium hexaferrites

Abstract

Y-type hexaferrites powder samples of Ba1·8Sr0·2Co2Fe12-xTbxO22 (with x = 0.0, 0.1, and 0.2) were prepared by the method of sol-gel auto combustion. XRD and Rietveld refinement analysis shows that the prepared Y-type hexaferrites samples exhibit pure crystalline phase with the absence of impurity. FTIR study gives an idea of the formation of Y-type hexaferrites by the appearance of three characteristics bands at 409, 433, and 552 cm−1. FESEM analysis shows plate-like morphology with the presence of all hosts and substituted elements observed in the EDX spectra and mapping. The grain size decreases with increase in the concentration of Tb3+, the particle size was observed to be in the range 56.48–58.54 nm. Typical dielectric response of ferrites was observed in the dielectric analysis. Cole-Cole plot shows that the contribution of grain is negligible compared to grain boundaries contribution. The multi domain magnetic nature of the prepared Y-type hexaferrite samples resulted in domain wall displacement and consequently influences the values of the coercivity.