Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/60228
Type: Artigo de periódico
Title: INFLUENCE OF Co DOPING ON STRUCTURAL, OPTICAL AND MAGNETIC STUDIES OF Co-DOPED CeO2 NANOPARTICLES
Author: Kumar, S
Koo, BH
Sharma, SK
Knobel, M
Lee, CG
Abstract: We have used the co-precipitation technique to synthesize nanocrystalline Co-doped CeO2 dilute magnetic semiconductors with Co concentrations ranging from 0.0-0.07. X-ray diffraction patterns (XRD) demonstrate that all the samples display single phase cubic structure without any impurity phase. Average particle sizes calculated from XRD and transmission electron microscopy (TEM) studies showed a gradual decrease with increase in Co ions concentration. UV-visible optical spectroscopy measurements reflect an energy band gap, which decreases with the increasing concentration of dopant (x <= 0.03). Raman spectra show an intensity loss of classical CeO2 vibration modes, which is an indication of considerable structural modifications and disorder in CeO2 lattice. Magnetic measurements revealed that all the samples exhibit a weak ferromagnetism at room temperature.
Subject: CeO2
spintronics
X-ray diffraction
Raman spectroscopy
DC magnetization
field emission transmission electron microscopy
Country: Singapura
Editor: World Scientific Publ Co Pte Ltd
Rights: fechado
Identifier DOI: 10.1142/S1793292010002268
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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