In this research, the growth of the cobalt doped lead iodate crystals is reported. The crystals were grown in silica gel medium by single diffusion technique. It was observed that, size of the crystals increased with increasing the doping concentration of Co2+. Influence of doping, on the crystallite structure and band gap energy has been investigated using XRD and UV-Vis. XRD analysis reveals that average grain size of the crystal decreased with increasing the doping concentration of Co2+ ions. The study of UV absorption spectra reveals that the % of transmission and value of band gap decreased slightly as the concentration of cobalt increased.
