Mossbauer spectroscopy study of iron oxide nanoparticles obtained by spray pyrolysis
Carregando...
Data
Orientador
Coorientador
Pós-graduação
Curso de graduação
Título da Revista
ISSN da Revista
Título de Volume
Editor
Springer
Tipo
Trabalho apresentado em evento
Direito de acesso
Acesso aberto
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
Idioma
Inglês
Citação
Hyperfine Interactions. Dordrecht: Springer, v. 189, n. 1-3, p. 159-166, 2009.
