Maensiri Santi, Phokha Sumalin, Laokul Paveena, Seraphin Supapan
Integrated Nanotechnology Research Center and Small and Strong Materials Group, Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand.
J Nanosci Nanotechnol. 2009 Nov;9(11):6415-20. doi: 10.1166/jnn.2009.1372.
RT ferromagnetism was observed in nanoparticles of Fe-doped CeO2 (i.e., Ce(0.97)Fe(0.03)O2) synthesized by a sol-gel method. The undoped and Fe-doped CeO2 were characterized by XRD, Raman spectroscopy, TEM, and VSM. The undoped samples and Ce(0.97)Fe(0.03)O2 precursor exhibit a diamagnetic behavior. The 673 K-calcined Ce(0.97)Fe(0.03)O2 sample is paramagnetic whereas 773 and 873 K-calcined Ce(0.97)Fe(0.03)O2 samples are ferromagnetism having the magnetizations of 4.65 x 10(-3) emu/g and 6.20 x 10(-3) emu/g at 10 kOe, respectively. Our results indicate that the ferromagnetic property is intrinsic to the Fe-doped CeO2 system and is not a result of any secondary magnetic phase or cluster formation.
通过溶胶-凝胶法合成的Fe掺杂CeO2（即Ce(0.97)Fe(0.03)O2）纳米颗粒中观察到室温铁磁性。通过X射线衍射（XRD）、拉曼光谱、透射电子显微镜（TEM）和振动样品磁强计（VSM）对未掺杂和Fe掺杂的CeO2进行了表征。未掺杂样品和Ce(0.97)Fe(0.03)O2前驱体表现出抗磁性行为。673K煅烧的Ce(0.97)Fe(0.03)O2样品是顺磁性的，而773K和873K煅烧的Ce(0.97)Fe(0.03)O2样品是铁磁性的，在10kOe下的磁化强度分别为4.65×10(-3)emu/g和6.20×10(-3)emu/g。我们的结果表明，铁磁性质是Fe掺杂CeO2体系所固有的，而不是任何二次磁相或团簇形成的结果。
