Morphology-Controlled Synthesis of CeO₂ Microstructures and Their Room Temperature Ferromagnetism

Fanming Meng^1,2，Zhenghua Fan¹，Cheng Zhang¹，Youdi Hu¹，Tao Guan¹，Aixia Li¹

1. School of Physics and Materials Science, Anhui University2. Key laboratory of Materials Modification by Laser, Ion and Electron Beams (Dalian University of Technology), Ministry of Education

摘 要：Gear-shape CeO₂ microstructures have been synthesized via a facile hydrothermal method with Ce（NO₃）₃·6H₂O as the cerium source, NH₄HCO₃ as both the precipitator and the carbon source, and cetyltrimethyl ammonium bromide（CTAB） as the surfactant. X-ray diffraction（XRD） inferred that the synthesized CeO₂ microstructures exhibited a fluorite structure. The band gap（Eg） of CeO₂ samples is larger than that of bulk. X-ray photoelectron spectroscopy（XPS） showed that there are plenty of Ce³⁺ ions and oxygen vacancies at the surface of CeO₂ samples. All the synthesized CeO₂ samples exhibited the room temperature ferromagnetism, and the saturation magnetization increases with the increases of lattice parameter and Eg. The room temperature ferromagnetism mechanism of gear-shape CeO₂ is mainly attributed to the influence Ce³⁺ ions.

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