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Iron oxide nano particles with nominal Fe2O3 stoichiometry were synthesizedby a wet, soft chemical method with the heat treatment temperatures from250{\deg}C to 900{\deg}C in air. The variation in the structural properties ofthe nano particles with the heat treatment temperature was studied by X-raydiffraction and Fe K shell X-ray absorption study. X-ray diffractograms showthat at lower annealing temperatures nano particle comprises both maghemite andhematite phases. With increasing temperature, the remainder of the maghemitephase transformed completely to hematite. Profile analysis of the leading Braggreflections reveals that the average crystallite size increases from 50 nm to150 nm with increasing temperature. The mean primary particle size decreasedfrom 105 nm to 90 nm with increasing heat treatment temperature. The X-raydiffraction results are paralleled by systematic changes in the pre-edgestructure of the Fe K-edge X-ray absorption spectra, in particular by a gradualdecrease of the t2g/eg peak height ratio of the two leading pre-edgeresonances, confirming oxidation of the Fe from Fe2+ towards Fe3+. Transmissionelectron microscopy (TEM) on the samples treated at temperatures as high as900{\deg}C showed particles with prismatic morphology along with the formationof stacking fault like defects. High resolution TEM with selected area electrondiffraction (SAED) of samples heat treated above 350{\deg}C showed that thenano particles have well developed lattice fringes corresponding to that of(110) plane of hematite.

current applied physics

Evolution of structural properties of iron oxide nano particles during  temperature treatment from 250{\deg}C - 900{\deg}C: X-ray diffraction and Fe  K-shell pre-edge X-ray absorption study