Two kinds of nanometer-sized mixed metal oxide (MMO) particles (Zn_1-xMg_xO and Zn_1-xCo_xO) with very precise stoichiometry are prepared employing a versatile polymer-based method. The precursor is formed by loading different metal ions in polyacrylates and purified via repeated precipitation/redissolution cycles. The calcination of polymer precursor at relatively low temperature (550 ^oC) gives metastable solid solution of oxide systems in a particular range of composition. The MMO crystal particles are typically 20-50 nm in diameter. Doping of Mg in ZnO lattice causes a shrinkage of the lattice parameter c, while it remains unchanged with Co incorporated. Effects of band gap engineering on the optical band gap are seen in the Mg:ZnO system. The photoluminescence in the visible is enhanced by incorporation of magnesium on zinc lattice sites, while the visible emission is suppressed in the Co:ZnO system. This points toward the usefulness of our approach to create photo emissive materials with tuneable sensitivity. Magnetic properties of cobalt doped-ZnO were investigated as well. Ferromagnetic ordering was not found in our sample.

We believe that this method has a wide scope of application for the preparation of powders of mixed metal oxide alloys of metastable type from a polymer metal ion complex as the precursor, which is converted to the MMO at relatively low temperature where sintering is not yet prevailing.

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