Structure and Magnetic Properties of Monodisperse Fe3+-doped CeO2 Nanospheres

• DOI: 10.1007/bf03353753
• Publication Date: 2014-10-15T19:01:05Z
• Authors: Sumalin Phokha; Supree Pinitsoontorn; Santi Maensiri
• Keywords: Magnetic Properties; Materials Science; Synthesis and Applications of Ferrite Nanoparticles; Spinel; 02 engineering and technology; Paramagnetism; Magnetization; Quantum mechanics; Analytical Chemistry (journal); Geochemistry and Petrology; High-resolution transmission electron microscopy; Materials Chemistry; Doping; Nanotechnology; Zinc Oxide Nanostructures; Optoelectronics; Geochemistry of Manganese Oxides in Sedimentary Environments; Spectroscopy; FOS: Nanotechnology; Chromatography; Crystallography; Physics; Optics; Condensed matter physics; Materials science; XANES; Electronic, Optical and Magnetic Materials; Nanostructures; Earth and Planetary Sciences; Catalytic Nanomaterials; Chemistry; Magnetocaloric Materials Research; Magnetic field; Metallurgy; Physical Sciences; Raman spectroscopy; Ferromagnetism; 0210 nano-technology; Transmission electron microscopy

Abstract This work reports the study concerning the structure and magnetic properties of undoped CeO2 and Fe-doped CeO2 (Ce1−x Fe x O2, 0.01 ≤ x ≤ 0.07) nanospheres with diameters of 100∼200 nm prepared by hydrothermal method using polyvinylpyrrolidone (PVP) as surfactant. The prepared samples were studied by using X-ray diffraction (XRD), Raman spectroscopy, transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), X-ray absorption near-edge structure (XANES), and vibrating sample magnetometry (VSM). The XRD results showed that Fe-doped CeO2 was single-phased with a cubic structure, and with Fe3+ successfully substituting in Ce4+ sites. Raman spectra showed a redshift of F2g mode that caused by the Fe doping. The samples of both undoped CeO2 and Fe-doped CeO2 exhibited room temperature ferromagnetism, and the saturated magnetization (M

s ) increased with increasing Fe content until x = 0.05, and then the samples displayed ferromagnetic loops as well as paramagnetic behavior. The roles of Ce3+ and Fe3+ spin electrons are discussed for the ferromagnetism in the Fe-doped CeO2.