INTEMA   05428
INSTITUTO DE INVESTIGACIONES EN CIENCIA Y TECNOLOGIA DE MATERIALES
Unidad Ejecutora - UE
artículos
Título:
Mechanochemical activation of a titanium-magnetite mixture: Mössbauer spectroscopy study
Autor/es:
A.A.CRISTÓBAL, E.F.AGLIETTI, J.M.PORTO LÓPEZ, F.R.SIVES, R.C.MERCADER
Revista:
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Editorial:
Elsevier
Referencias:
Lugar: Amsterdam; Año: 2008 vol. 28 p. 2725 - 2730
ISSN:
0955-2219
Resumen:
Abstract
Mechanochemical activation has become a valuable tool in the design and synthesis of novel materials, due to the increased reactivity of activated
solids, and the possibility of synthesizing metastable phases not obtainable by conventional methods. In this work, ac magnetic susceptibility,
M¨ossbauer spectroscopy, X-ray diffraction (XRD) and scanning electron microscopy have been employed to study the structural and thermal
evolution of a mechanochemically activated TiFe3O4 mixture, with molar ratio Ti:Fe3O4 of 1:2. Upon activation in a high-energy planetary mill,
the mixtures undergoes a redox reaction, in which the Ti reduces the Fe ions of the spinel, resulting in a solid solution of variable composition
between magnetite (Fe3O4) and ulvospinel (TiFe2O4). The activation results in changes in the magnetic behavior of the mixture, and loss of
crystallinity. M¨ossbauer spectroscopy and XRD show the progressive disappearance of the original phases, and the formation of Fe0, Fe2O3 and
ulvospinel.3O4 mixture, with molar ratio Ti:Fe3O4 of 1:2. Upon activation in a high-energy planetary mill,
the mixtures undergoes a redox reaction, in which the Ti reduces the Fe ions of the spinel, resulting in a solid solution of variable composition
between magnetite (Fe3O4) and ulvospinel (TiFe2O4). The activation results in changes in the magnetic behavior of the mixture, and loss of
crystallinity. M¨ossbauer spectroscopy and XRD show the progressive disappearance of the original phases, and the formation of Fe0, Fe2O3 and
ulvospinel.3O4) and ulvospinel (TiFe2O4). The activation results in changes in the magnetic behavior of the mixture, and loss of
crystallinity. M¨ossbauer spectroscopy and XRD show the progressive disappearance of the original phases, and the formation of Fe0, Fe2O3 and
ulvospinel.0, Fe2O3 and
ulvospinel.
© 2008 Published by Elsevier Ltd.© 2008 Published by Elsevier Ltd.