Abstract
Polycrystalline Zn–Mn–O samples with nominal manganese concentrationx = 0.01 and 0.10 were synthesized by a solid state reaction route using(ZnC2O4·2H2O)1−x and (MnC2O4·2H2O)x. Thermal treatment of the samples was carried out in air at temperatures of 673, 773 and1173 K. The samples were investigated by x-ray diffraction, thermogravimetry, differentialthermal analysis, transmission electron microscopy, magnetization measurements and electronparamagnetic resonance. Room temperature ferromagnetism is observed in Zn–Mn–O samples withx = 0.01 thermally treated at low temperatures (673, 773 K). It seems thatthe ferromagnetic phase could originate from interactions betweenMn2+ ions and acceptor defects incorporated in the ZnO crystal lattice during the thermaltreatment of the samples.
Published Version
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