Artículos de revistas
Infrared Spectroscopy Analysis of Oxyhydroxides as Intermediate Species in the Formation of Iron Oxides-Silica Xerogels
Autor
SELINA REBECA DEL CARMEN PONCE CASTAÑEDA
SALVADOR ANTONIO PALOMARES SANCHEZ
FACUNDO RUIZ
OSCAR EDUARDO AYALA VALENZUELA
JOSE ANDRES MATUTES AQUINO
Institución
Resumen
A detailed infrared spectroscopy analysis in the 2500 to 3800 cm−1 region has
been used to study the formation of species in samples of iron oxides embedded in
silica xerogel matrix.We report the presence of α, β, and γ forms of iron oxyhydroxides
as intermediate species in the formation of α-Fe2O3, γ -Fe2O3 and ε-Fe2O3 starting from
three different iron precursors: iron nitrate, iron chloride and nanometric Fe particles
prepared by chemical reduction. Our results show that under thermal dehydration α and
γ forms of iron oxyhydroxides transform into hematite and maghemite, respectively,
whereas the β form transform to the ε-Fe2O3 without going through an intermediate iron
oxide phase.
Materias
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