المجلة الجزائرية للعلوم
Volume 3, Numéro 6, Pages 4-10
2019-06-03
Rietveld Fitting Method For The Combined Structural And Microstructural Determination In Iron Phosphides Diffraction
Authors : Wassila Tebib . Imana Khadraoui . Wissema Belkhiri . Ismahanea Chenouga .
Abstract
The Rietveld refinement allows the overall profile Of the experimental diffraction pattern to be directly adjusted by using as variables the instrumental characteristics in addition to the structural and microstructural parameters of the sample. More precisely, the refinement program minimizes, by an algorithm based on the least squares method, the function called residue. This refinement using the Rietveld method is an efficient procedure for the analysis of X-ray diffraction patterns of Fe20P (wt. %) nanostructured powders prepared by high energy ball milling. As a result, during milling, the deviations of the crystals parameters of the nanocrystallines phases, namely the solid solution of the phosphorus in the iron and the phosphates Fe2P, FeP and Fe3P, the refinement of the grain size and the increase of the average rate of micro-stresses exhibit significant distortion of the crystal Regu les Révisé le, Accepté le lattices and the variation phase's percentages.
Keywords
Rietveld Method, X-ray diffraction, Nanomaterials Me-chanical alloying phosphides
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