Article ID Journal Published Year Pages File Type
1805356 Journal of Magnetism and Magnetic Materials 2006 7 Pages PDF
Abstract

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. γ- to α- and/or ε-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 (MZFC) of the prepared samples was evaluated using superconducting quantum interference device (SQUID) magnetometer in temperature range from 4 to 300 K at 1 T.

Related Topics
Physical Sciences and Engineering Physics and Astronomy Condensed Matter Physics
Authors
, , ,