3. Results and Discussion
3.1 Structural Analysis
Fig.(1a-1c) represents the powder X-ray diffraction patterns of CoxCu(1-x)Fe2O4 sintered at
600°C. All the peaks of CoCuFe2O4 and CuFe2O4 could be indexed with the standard pattern reported in
the JCPDS card [22-23]. The XRD pattern reveals that the as prepared powder is a single phase ferrite
with spinel structure. This indicates that Co-Cu ferrites can be directly formed with calcination [24]. The
average crystallite sizes of prepared powders are calculated using the Debye-Scherrer formula and lattice
parameters are estimated and reported in Table (1). It is seen that the powder of synthesized ferrites
consists of nano crystalline particles with size in the range of 3 18 nm. Also it reveals that the addition of
copper found to obstruct the grain growth which results in a decrease in the crystallite size. Recent reports
[25-26] claim that there is a decrease in crystallite size with increase in Cu substitution for ferrite
nanoparticles.