where as if the Co 2+ ions are in an octahedral environm ent in the wurtzite structure, it would have shown a significant increase in the cell parameters since octahedral Co 2+ has a radius between 0.65 Å (low spin) and 0.745 Å (high spin) [27]. In the present investigations, it is observed that the lattice cell parameters are slightly increased hence it is said to be that the doped Co 2+ ions enter the host lattice at octahedral site symmetry.