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Vol. 5 No. 4 (2013)

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

https://doi.org/10.1007/BF03353753
Sumalin Phokha
Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, 40002 Thailand
Supree Pinitsoontorn
Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, 40002 Thailand
Santi Maensiri
School of Physics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, 30000 Thailand

Corresponding Author: Santi Maensiri

santimaensiri@g.sut.ac.th

Nano-Micro Letters, Vol. 5 No. 4 (2013), Article Number: 223-233

Abstract

This work reports the study concerning the structure and magnetic properties of undoped CeO2 and Fe-doped CeO2 (Ce1−xFe 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.

Keywords

Cerium oxide Nanospheres Dilute magnetic oxide Ferromagnetism Oxygen vacancies XANES
Phokha, Sumalin, Supree Pinitsoontorn, and Santi Maensiri. 2013. “Structure and Magnetic Properties of Monodisperse Fe3+-Doped CeO2 Nanospheres”. Nano-Micro Letters 5 (4):223-33. https://doi.org/10.1007/BF03353753.
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