Extended X-ray absorption fine structure analysis of Ni-P and Fe-P amorphous alloys at the phosphorus k-edge

摘要

Amorphous alloys have unusual physical properties, such as excellent corrosion resistance, owing to their short-range order and lack of grain boundaries. The presence of metalloids, such as P, B, C, Si etc., lead to the formation of amorphous or glassy structure. In a previous study, Lalvani et al. [1] have studied the structure of the alloys by X-ray absorption near edge structure (XMANES) spectroscopic analysis. The energy levels used in the study of the structures were quite low (less than 2200 eV) which enabled the investigation of P K-edge. Their research indicated both a metalloid P character in amorphous Ni-P and the transfer of charge from Ni to P-p orbitals in the material. The also show that the scratching of the sample leads to a p~(5+)-oxidized feature. The Fe-P sample appeared to indicate a stronger (relative to the Ni-P sample) transition to metal-P hybridization.