Abstract
Nanosize lead hexaferrite particles are synthesized by citrate precursor technique and characterized by XRD, SEM, BET surface area measurements and Mossbauer spectroscopy. Mossbauer studies of these particles show the ferrimagnetic and/or superparamagnetic nature and a change in the hyperfine parameters is observed for the smaller particles. In magnetic studies, hexaferrite (PbFe 12 O 19 ) particles show considerable enhancement in T C from the bulk value of 725 to 878 K, when the particles are reduced to the smaller size. The values of coercive force (H ic ) and of saturation and remanent magnetization (σ s and σ r ) are also observed to change with decreasing particle size. These results are explained based on the coherent rotational model for an assembly of single domain particles oriented at random and are presented in this paper.
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