Infrared Spectroscopy Analysis of Oxyhydroxides as Intermediate Species in the Formation of Iron Oxides-Silica Xerogels |
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Authors: | S Ponce-Castañeda JR Martínez S Palomares-Sánchez Facundo Ruiz O Ayala-Valenzuela JA Matutes-Aquino |
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Institution: | (1) Facultad de Ciencias, Universidad Autónoma de San Luis Potosí, 78000 San Luis Potosí, S.L.P., México;(2) Instituto Potosino de Investigación Científica y Tecnológica, Av. V. Carranza 2025, San Luis Potosí, S.L.P., México;(3) Centro de Investigación en Materiales Avanzados, Chihuahua, México |
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Abstract: | 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 , , and forms of iron oxyhydroxides as intermediate species in the formation of -Fe2O3, -Fe2O3 and -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 and forms of iron oxyhydroxides transform into hematite and maghemite, respectively, whereas the form transform to the -Fe2O3 without going through an intermediate iron oxide phase. |
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Keywords: | sol-gel infrared (IR) spectroscopy vibrating sample magnetometry composites oxyhydroxides |
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