Diffraction anomalous fine structure is a recently developed technique which can provide a measurement of the local structure of a given element in a particular phase or crystallographic site. Most previous investigations have applied the technique to bulk solids, thin films, and nano-dots or wires on crystalline substrates. In this paper, the technique is applied to highly disordered nanometre-sized Fe/Fe oxide core-shell nanocrystalline powders, the diffraction patterns of which exhibit weak and greatly broadened diffraction peaks. Focusing on the oxide shell diffraction peaks, a qualitative analysis of the near-edge spectral region and a quantitative analysis of the extended energy region are provided; in particular, good quality fittings of the extended range spectra are obtained. The local structure is selectively probed around the tetrahedral and octahedral sites of the oxide shell, finding the presence of a high degree of structural disorder. This study demonstrates that diffraction anomalous fine structure can now be fruitfully applied to nanocrystalline powders

Meneghini, C., F., B., L., P., E., B., H., R. (2009). Diffraction anomalous fine structure study of iron/iron oxide nanoparticles,. JOURNAL OF APPLIED CRYSTALLOGRAPHY, 42, 642-648 [10.1107/S002188980902353X].

Diffraction anomalous fine structure study of iron/iron oxide nanoparticles,

MENEGHINI, CARLO;
2009

Abstract

Diffraction anomalous fine structure is a recently developed technique which can provide a measurement of the local structure of a given element in a particular phase or crystallographic site. Most previous investigations have applied the technique to bulk solids, thin films, and nano-dots or wires on crystalline substrates. In this paper, the technique is applied to highly disordered nanometre-sized Fe/Fe oxide core-shell nanocrystalline powders, the diffraction patterns of which exhibit weak and greatly broadened diffraction peaks. Focusing on the oxide shell diffraction peaks, a qualitative analysis of the near-edge spectral region and a quantitative analysis of the extended energy region are provided; in particular, good quality fittings of the extended range spectra are obtained. The local structure is selectively probed around the tetrahedral and octahedral sites of the oxide shell, finding the presence of a high degree of structural disorder. This study demonstrates that diffraction anomalous fine structure can now be fruitfully applied to nanocrystalline powders
Meneghini, C., F., B., L., P., E., B., H., R. (2009). Diffraction anomalous fine structure study of iron/iron oxide nanoparticles,. JOURNAL OF APPLIED CRYSTALLOGRAPHY, 42, 642-648 [10.1107/S002188980902353X].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/146629
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