Abstract
Nanosized M-type hexaferrites Sr(1-x)GdxFe12O19 (x = 0.00; 0.01<x < 0.09; insteps of 0.02) have been synthesized by auto combustion method using urea and citric acid mixtures. Influences of Gd3+ ions substitution on structural, electrical and magnetic properties of Sr1-xGdxFe12O19 nanoferrites were investigated by XRD, FTIR, FESEM, LCR meter and VSM techniques. The PXRD studies confirmed the formation of single phase lattice whereas as the sample with x = 0.09 exhibits about 5% of secondary phase. It was found that the lattice parameter increased with increasing in Gd3+ ion content. FTIR spectra have shown two absorption bands. The dielectric parameters were described based on the Maxwell–Wagner's two layer model. It is observed that the dielectric constant (ε′), the loss tangent (tanδ), decrease whereas the AC conductivity (σac) increases with increasing applied field frequency. Moreover, the vibrating sample magnetometer (VSM) analysis confirmed that M-SrHF's are hard magnetic in behavior. It was observed that the values of saturation magnetization (MS), remanence magnetization (Mr), coercivity (HC) and magnetic parameters of strontium ferrites decrease with the increase of the dopant Gd3+ in strontium ferrites. In addition, Gd3+ substituted SrFe12O19 are most useful for magnetic recording media and electro-magnetic devices.
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