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Study of changes in L 32 EELS ionization edges upon formation of Ni‐based intermetallic compounds
Author(s) -
Potapov P. L.,
Kulkova S. E.,
Schryvers D.
Publication year - 2003
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1046/j.1365-2818.2003.01176.x
Subject(s) - intermetallic , ionization , redistribution (election) , electron , valence (chemistry) , valence electron , ionization energy , materials science , chemistry , atomic physics , chemical physics , metallurgy , ion , physics , alloy , organic chemistry , politics , political science , law , quantum mechanics
Summary EELS L 32 ionization edges in several Ni‐based intermetallic compounds have been studied and interpreted in terms of the distribution of electrons in the valence d ‐bands. It is demonstrated that the integral EELS cross‐sections change only slightly upon the formation of intermetallic compounds and therefore the charge transfer between atoms is negligible. On the other hand, the changes in the fine energy‐loss near‐edge structure (ELNES) of the Ni L 3 edge can be readily detected indicating an important redistribution of d ‐electrons at the Ni site with alloying. These features are well reproduced by ab‐initio calculations with a FLAPW method in its WIEN97 implementation. In contrast to the drastic effect of chemical environment, structural transformations in the investigated intermetallics result in smaller ELNES changes, which can be detected by only exceptional instruments with a higher energy resolution.