Abstract
Nanosized particles of SrFe12O19 have been synthesized by citrate precursor technique having Fe/Sr ratios of 12.0 to 9.0. XRD, SEM, BET surface area, magnetic and Mössbauer studies were carried out for all these particles. Mössbauer study reveals the change in hyperfine parameters with decline in párticle size and Fe/Sr ratios. A coercive force of 6500 Oe is obtained for the SrFe12O19 particles with Fe/Sr ratio 10.8 having 116 nm BET particle size. This value is one of the highest value reported for isotropic SrFe12O19 samples. A considerable enhancement in Tc from the bulk value of 750 to 883K was observed for XRD particle size of 20 to 5.7nm. The shift in Tc is well defined by the finite size scaling formula [Tc(D) - Tc(∞)][Tc(∞)]-1=±(D/Do)-1/v with v = 0.75 ± 0.02 and Do = 1.52nm.
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