Abstract
Here we report nonmagnetic Mg doped CeO2 (Ce1-xMgxO2, 0.00 ≤ x ≤ 0.08) synthesized via a facile hydrothermal method. The influence of Mg doping on the structure, morphology, optical and magnetic properties of CeO2 were examined by XRD, SEM, TEM, XPS, Raman, UV–vis and M-H curve. The SEM and TEM images display that as-synthesized samples are composed of the bundle of nanowires. Raman scattering shows that Mg doping causes a huge redshift of F2g mode. The absorption spectra indicate that band gap energy becomes narrow and drops to 3.00 eV with Mg doping, which are attributed to the presence of defects forming a band of electron states. Magnetic measurements show saturation magnetization (MS) initially increases and then decreases and the largest MS of 1.5 × 10−3 emu/g appears at 4 at.% Mg-doped CeO2, which is likely explained by a VO mediated F-center exchange (FCE) mechanism.
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