4. Conclusion
CoxCu(1-x)Fe2O4 nanoparticles are successfully prepared by co-precipitation method. The FT-IR
spectra show main absoption bands at ~500 cm-1 to 400 cm-1 corresponding to the vibration modes of all
spinel compounds. The XRD pattern reveals that synthesized ferrites are made of nano crystalline
particles with size in the range of 3 18nm. It is also observed that the crystallite size decreases with Cu
substitution. The dielectric constant value varies from 522.31 to 10.44 at 600º C and this high value of
dielectric constant is attained due to the lower particle size and higher value of crystallinity.