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Ferrimagnetic oxides may contain single or multi domain particles and they convert into superparamagnetic state near a critical size.To explore the existence of these particles CoFe2-xCuxO4 mixed ferrite nanoparticles of different sizes were prepared through citrate-gel method.The structural aspects of the samples were explored by a wide variety of experimental techniques namely,X-ray diffraction,field emission transmission electron microscopy,vibrational sample magnetometery and M(o)ssbauer spectroscopy.