  The nanoparticles (NPs) of Zn1-xCuxFe2O4 (ZCFO) spinels with x = 0, 0.2, 0.4,
0.6 and 0.8 were synthesized by a sol-gel combustion method using acetate
precursor. The NPs of ZCFO were prepared by following calcination process at
600C for 8hrs. The synthesized NPs of ZCFO were characterized by X-ray
diffraction (XRD) analysis using Rietveld refinement. The Rietveld refinement
of the XRD patterns revealed that the ZCFO spinels crystallize into single
diamond cubic structure with Fd-3m space group. The lattice constant and unit
cell volume for ZCFO NPs shrink with enhancing doping concentration of Cu2+
ion. The crystalline growth in the NPs of ZCFO was examined by peak broadening
present in the XRD pattern. The Williamson-Hall (W-H) plot method were used to
study the individual involvements of crystallite sizes and lattice strain on
the peak broadening of the NPs of ZCFO spinels. Whereas, particle size of the
ZCFO sample with x = 0.40 was estimated by high-resolution scanning electron
microscopy micrographs
