Effect of Fe^{2+} (Fe^{3+}) Doping on Structural Properties οf CeO_2 Nanocrystals

• Authors: M. Radović , Z. Dohčević-Mitrović , N. Paunović , M. Šćepanović , B. Matović , Z. Popović
• Languages of publication: EN

Abstracts

EN

We have measured the Raman scattering and magnetization of pure and Fe^{2+}(Fe^{3+}) doped CeO_2 nanopowders at room temperature. The Raman scattering spectra revealed the existence of CeO_2 fluorite cubic structure for all investigated samples. The Raman active mode at about 600 cm^{-1}, seen in all samples, can be ascribed to the CeO_2 intrinsic oxygen vacancies. Additional Raman modes at 720 cm^{-1}, 1320 cm^{-1} and 1600 cm^{-1}, which appear in the spectra of doped samples, can be assigned to maghemite (γ-Fe_2O_3) cation deficient structure, to 2ω_{LO} IR-allowed overtone and two magnon structure, respectively. This implies that our powders are composed of mixed valence states and have defective structure. Presence of oxygen defect states and magnetic ions can be responsible for the observed ferromagnetism at room temperature in both pure and Fe doped samples.

Keywords

EN

61.72.uj; 78.30.-j; 75.50.Tt

Discipline

• 61.72.uj: III-V and II-VI semiconductors
• 75.50.Tt: Fine-particle systems; nanocrystalline materials
• 78.30.-j: Infrared and Raman spectra(for vibrational states in crystals and disordered systems, see 63.20.-e and 63.50.-x, respectively; for Raman spectra of superconductors, see 74.25.nd)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2009
• Volume: 116
• Issue: 1
• Pages: 84-87

Dates

published

2009-07

Contributors

author

M. Radović

• Center for Solid State Physics and New Materials, Institute of Physics, Belgrade, Serbia

author

Z. Dohčević-Mitrović

• Center for Solid State Physics and New Materials, Institute of Physics, Belgrade, Serbia

author

N. Paunović

• Center for Solid State Physics and New Materials, Institute of Physics, Belgrade, Serbia

author

M. Šćepanović

• Center for Solid State Physics and New Materials, Institute of Physics, Belgrade, Serbia

author

B. Matović

• Institute of Nuclear Sciences "Vinča", 11001 Belgrade, Serbia

author

Z. Popović

• Center for Solid State Physics and New Materials, Institute of Physics, Belgrade, Serbia

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Identifiers

DOI

10.12693/APhysPolA.116.84