Abstract
Nanoparticles of Co0.5Zn0.4Cu0.1Fe2O4 were prepared by a combination of sonochemical and standard coprecipitation methods. The as-prepared samples were heat treated at four different temperatures to obtain particles of different sizes. The formation of the nanocrystalline phase has been confirmed by X-ray diffractograms (XRDs). The sizes of the nanoparticles have been estimated from the (311) peak of the XRD patterns using the Debye−Scherrer formula. The nanoparticles of some selected samples were coated with two different nonmagnetic matrices, viz., alumina (Al2O3) and poly(vinyl alcohol) (PVA). Results of high-resolution transmission electron microscopy observations of some samples are in agreement with those extracted from the XRD data. The inclusion of sonochemical technique in the coprecipitation method reduces the distribution of sizes of nanoparticles. The static magnetic properties have been measured with maximum applied field of 2 T, and the dynamic magnetic properties have also been observed at ...
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