本研究利用共沉澱法製備掺雜Sm的CeO2 奈米粉末。奈米粉末之晶相、結構及室溫下磁性分別利用X光繞射儀(XRD)、吸收光譜 (X-ray Absorption Spectroscopy，XAS)、磁圓偏振二向性(Magnetic Circular Dichroism,MCD)、及超導量子干涉磁化儀 (Superconducting Quantum Interference Device Magnetometer, SQUID) 進行分析。本研究並利用延伸 X 光吸收精細結構 (The Extended X-ray Absorption Fine Structure (EXAFS))分析奈米粉末中不同元素的配位數及鍵長的改變。結果顯示，以此方式製備之CeO2的Sm之價態為三價；Sm離子以Sm2O3氧化物的型態存在於CeO2奈米顆粒內，且XAS光譜分析結果顯示，Sm2O3傾向於分佈在CeO2顆粒表面。Sm2O3形式將使周圍的CeO2形成氧空缺，使樣品的Ce3+含量上升，此結果同時造成飽和磁化量微幅的增加。

The Sm-doped CeO2 nanoparticles were prepared by the precipitation method. The crystal structure, phase and room temperature magnetism of the nanoparticles were investigated by X-ray Diffraction (XRD), X-ray Absorption Spectroscopy(XAS), Magnetic Circular Dichroism (MCD) and Superconducting Quantum Interference Device (SQUID). The change of coordination number and bond length of different elements inside the nanoparticles were analyzed by the Extended X-ray Absorption Fine Structure (EXAFS) spectra. Our results presented that the valence of Sm is tri-valence. In addition, the formation of Sm2O3 was observed. According to the XAS analysis results, Sm2O3 clusters tend to locate at the surface of CeO2 particles. The existence of Sm2O3 also lead to the formation of oxygen vacancy at the interface between Sm2O3 and CeO2, and then increase the concentration of Ce3+. Above differences including the concentration of Ce3+ as well as the distribution result in the enhancement of Ms.

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