Mossbauer spectroscopy study of iron oxide nanoparticles obtained by spray pyrolysis
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Data
2009-02-01
Autores
Marques, Rodrigo Fernando Costa [UNESP]
Rodriguez, A. F. R.
Coaquira, J. A. H.
Santos, J. G.
Garg, V. K.
Jafelicci, M. [UNESP]
Ribeiro, Sidney José Lima [UNESP]
Verelst, M.
Dexpert-Ghys, J.
Morais, P. C.
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Editor
Springer
Resumo
Mossbauer spectroscopy was used in this study to investigate magnetite nanoparticles, obtained by spray pyrolysis and thermal treatment under H-2 reduction atmosphere. Room temperature XRD data indicate the formation of magnetite phase and a second phase (metallic iron) which amount increases as the time of reduction under H2 is increased. While room temperature Mossbauer data confirm the formation of the cubic phase of magnetite and the occurrence of metallic iron phase, the more complex features of 77 K-Mossbauer spectra suggest the occurrence of electronic localization favored by the different crystalline phase of magnetite at low temperatures which transition to the lower symmetry structure should occur at T similar to 120 K (Verwey transition).
Descrição
Palavras-chave
Magnetite, Hematite, Spray pyrolysis, Mossbauer spectroscopy
Como citar
Hyperfine Interactions. Dordrecht: Springer, v. 189, n. 1-3, p. 159-166, 2009.