首页 | 本学科首页   官方微博 | 高级检索  
     检索      


Infrared Spectroscopy Analysis of Oxyhydroxides as Intermediate Species in the Formation of Iron Oxides-Silica Xerogels
Authors:S Ponce-Castañeda  JR Martínez  S Palomares-Sánchez  Facundo Ruiz  O Ayala-Valenzuela  JA Matutes-Aquino
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
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 agr, beta, and gamma forms of iron oxyhydroxides as intermediate species in the formation of agr-Fe2O3, gamma-Fe2O3 and epsi-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 agr and gamma forms of iron oxyhydroxides transform into hematite and maghemite, respectively, whereas the beta form transform to the epsi-Fe2O3 without going through an intermediate iron oxide phase.
Keywords:sol-gel  infrared (IR) spectroscopy  vibrating sample magnetometry  composites  oxyhydroxides
本文献已被 SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号