Abstract
Zn 0.96Mn 0.03Al 0.01O powders have been synthesized using the co-precipitation technique. X-ray diffraction patterns show the typical würtzite structure with no additional peaks for all samples. Raman spectroscopy revealed that Mn 2+ ions were substituted for Zn 2+ into the ZnO matrix and that Al and Mn ions activate an additional vibration mode at 670 cm − 1 which is specific to interstitial defects. The resistance measurements give a confirmation of the presence of free carriers. Nevertheless, magnetization measurements revealed only a mixture of paramagnetic and antiferromagnetic behaviors for all samples with no sign of ferromagnetism.
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