Abstract
The aim of this work is to investigate the microstructure development of Fe 2O 3 nanocrystal, prepared in sol–gel process, as a function of annealing temperature in air. Combined with the TEM and XRD patterns, small-angle scattering of X-rays (SAXS) reveals that the size of Fe 2O 3 nanocrystal increases and Fe 2O 3 structure changes from maghemite to hematite (γ to α) by increasing annealing temperature. SAXS also indicates that the growth of Fe 2O 3 nanocrystal follows fractal. When the annealing temperature is increased, fractal property of Fe 2O 3 nanocrystal changes from volume fractal to surface fractal, corresponding to the formation of Fe 2O 3 network.
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