Structural studies of iron selenides prepared by mechanical alloying

The structural evolution of a binary alloy with nominal composition Fe 25Se 75 prepared by ball milling was investigated as a function of milling time. The X-ray diffraction (XRD) patterns showed that for milling times up to 20 h, the FeSe 2 phase is formed and excess selenium remains in the amorpho...

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Veröffentlicht in:	Solid state communications 2002-01, Vol.123 (3), p.179-184
Hauptverfasser:	Campos, C.E.M., de Lima, J.C., Grandi, T.A., Machado, K.D., Pizani, P.S.
Format:	Artikel
Sprache:	eng
Schlagworte:	A. Nanostructures B. Chemical synthesis C. Crystal structure and symmetry C. X-ray scattering Clusters, nanoparticles, and nanocrystalline materials Condensed matter: structure, mechanical and thermal properties E. Inelastic scattering Exact sciences and technology Lattice dynamics Nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals Phonons and vibrations in crystal lattices Phonons in crystal lattices Physics Structure of solids and liquids crystallography X-ray diffraction and scattering
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Zusammenfassung:	The structural evolution of a binary alloy with nominal composition Fe 25Se 75 prepared by ball milling was investigated as a function of milling time. The X-ray diffraction (XRD) patterns showed that for milling times up to 20 h, the FeSe 2 phase is formed and excess selenium remains in the amorphous state. For milling times between 40 and 52 h, FeSe 2 is partially transformed to β-FeSe and/or Fe 7Se 8. The structural evolution of the mixture with milling time was followed using the XRD, differential scanning calorimetry and Raman spectroscopy techniques.
ISSN:	0038-1098 1879-2766
DOI:	10.1016/S0038-1098(02)00232-6