Please use this identifier to cite or link to this item: http://cimav.repositorioinstitucional.mx/jspui/handle/1004/1029
Infrared Spectroscopy Analysis of Oxyhydroxides as Intermediate Species in the Formation of Iron Oxides-Silica Xerogels
SELINA REBECA DEL CARMEN PONCE CASTAÑEDA
SALVADOR ANTONIO PALOMARES SANCHEZ
FACUNDO RUIZ
OSCAR EDUARDO AYALA VALENZUELA
JOSE ANDRES MATUTES AQUINO
Acceso Abierto
Sin Derechos Reservados
sol-gel
vibrating sample magnetometry
oxyhydroxides
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.
2003
Artículo
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