Synthesis of Fe2O3 concentrations and sintering temperature on FTIR and magnetic susceptibility measured from 4 to 300 K of monolith silica gel prepared by sol-gel technique

被引:47
作者
Battisha, I. K. [1 ]
Afifya, H. H.
Ibrahim, M.
机构
[1] Natl Res Ctr, Solid State Dept, Dokki, Guiza, Egypt
[2] Natl Res Ctr, Dept Spect, Dokki, Guiza, Egypt
关键词
silica gel; monolith; FTIR; XRD; SEM; magnetic susceptibility at zero field cooling (M-ZFC);
D O I
10.1016/j.jmmm.2006.01.251
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Nano-crystalline ferric oxide was synthesized inside an amorphous silica matrix by the sol-gel method. The formation of ferric oxide can be detected, giving fine particles around 5-10 nm crystallite sizes calculated from win-fit program. This is associated with a specific role of the silica matrix, which facilitates the diffusion of the reacting cations, enhancing the ferric oxide formation. gamma- to alpha- and/or epsilon-Fe2O3 transformations take place by increasing the Fe2O3 concentration for samples sintering at constant-heat treatment temperature. The dried monolith gel materials were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR), as well as by scanning electron microscopy (SEM). The magnetic susceptibility at zero-field cooling (M-ZFC) of the prepared samples was evaluated using superconducting quantum interference device (SQUID) magnetometer in temperature range from 4 to 300 K at I T. (C) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:211 / 217
页数:7
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