INTEMA   05428
INSTITUTO DE INVESTIGACIONES EN CIENCIA Y TECNOLOGIA DE MATERIALES
Unidad Ejecutora - UE
artículos
Título:
Structural alterations during mechanochemical activation of a titanium-magnetite mixture
Autor/es:
A.A.CRISTÓBAL, E.F.AGLIETTI, M.S.CONCONI, J.M.PORTO LÓPEZ
Revista:
MATERIALS CHEMISTRY AND PHYSICS
Editorial:
Elsevier
Referencias:
Lugar: Amsterdam; Año: 2008 vol. 111 p. 341 - 345
ISSN:
0254-0584
Resumen:
a b s t r a c t
In this work, mechanochemical activation and thermal behaviour of (Ti + Fe3O4) mixtures in Ti/Fe3O43O4) mixtures in Ti/Fe3O4
molar ratios 0.5, 1, and 1.5, are studied. The samples were activated under Ar atmosphere, thermally
treated at temperatures ranging between 400 and 700 ◦C, and analyzed by XRD and Rietveld analysis,
SEM and EPMA. By XRD, a progressive decrease in crystallinity with the activation time of was
observed. For the samples with lower Ti contents, the system evolved towards the formation of a
ulvospinel (Fe2TiO4)magnetite (Fe3O4) solid solution, while for higher Ti contents the major phase
obtained was ilmenite (FeTiO3). During the activation at room temperature, low crystalline intermediate
phases (FeO + TiO, FeO, pseudobrookite [Fe2TiO5]) were generated, depending on the initial mixture
composition. Thermal treatments resulted in a progressive structural ordering, with lattice parameters
slightly greater than those of the original spinel.
These results suggest that during the activation at room temperature, the Ti reduces the Fe of the spinel
and partially replaces it in the lattice.◦C, and analyzed by XRD and Rietveld analysis,
SEM and EPMA. By XRD, a progressive decrease in crystallinity with the activation time of was
observed. For the samples with lower Ti contents, the system evolved towards the formation of a
ulvospinel (Fe2TiO4)magnetite (Fe3O4) solid solution, while for higher Ti contents the major phase
obtained was ilmenite (FeTiO3). During the activation at room temperature, low crystalline intermediate
phases (FeO + TiO, FeO, pseudobrookite [Fe2TiO5]) were generated, depending on the initial mixture
composition. Thermal treatments resulted in a progressive structural ordering, with lattice parameters
slightly greater than those of the original spinel.
These results suggest that during the activation at room temperature, the Ti reduces the Fe of the spinel
and partially replaces it in the lattice.2TiO4)magnetite (Fe3O4) solid solution, while for higher Ti contents the major phase
obtained was ilmenite (FeTiO3). During the activation at room temperature, low crystalline intermediate
phases (FeO + TiO, FeO, pseudobrookite [Fe2TiO5]) were generated, depending on the initial mixture
composition. Thermal treatments resulted in a progressive structural ordering, with lattice parameters
slightly greater than those of the original spinel.
These results suggest that during the activation at room temperature, the Ti reduces the Fe of the spinel
and partially replaces it in the lattice.3). During the activation at room temperature, low crystalline intermediate
phases (FeO + TiO, FeO, pseudobrookite [Fe2TiO5]) were generated, depending on the initial mixture
composition. Thermal treatments resulted in a progressive structural ordering, with lattice parameters
slightly greater than those of the original spinel.
These results suggest that during the activation at room temperature, the Ti reduces the Fe of the spinel
and partially replaces it in the lattice.2TiO5]) were generated, depending on the initial mixture
composition. Thermal treatments resulted in a progressive structural ordering, with lattice parameters
slightly greater than those of the original spinel.
These results suggest that during the activation at room temperature, the Ti reduces the Fe of the spinel
and partially replaces it in the lattice.