Publicação: Mossbauer spectroscopy study of iron oxide nanoparticles obtained by spray pyrolysis
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Springer
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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 H-2 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).
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Magnetite, Hematite, Spray pyrolysis, Mossbauer spectroscopy
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Inglês
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Isiame 2008. New York: Springer, p. 159-+, 2009.
