Abstract
Polycrystalline Zn0.938Co0.062O and Zn0.928Co0.062Cu0.01O oxides have been synthesized by solid state reaction. A single-phase wurtzite structure was formed in the polycrystalline samples with substituent Co and Cu in oxidation states of +2 and +1, respectively. The magnetization can be fitted with a paramagnetic Curie term, an antiferromagnetic Curie–Weiss term, and a diamagnetic constant. The results show that the substitution of Co at the Zn site does not occur randomly but Co ions appear to have a tendency to group, while the substitution of Cu at the Zn can reduce Co’s grouping tendency, resulting in more isolated free Co ions.
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