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Atomic Structure Imaging in ZnSe and Mixed Zn 0.74 Mn 0.2 Be 0.06 Se Crystals with X-ray Fluorescence Holography
Ist Teil von
Zeitschrift für physikalische Chemie (Neue Folge), 2016-04, Vol.230 (4), p.471-487
Erscheinungsjahr
2016
Link zum Volltext
Quelle
De Gruyter journals
Beschreibungen/Notizen
Abstract
X-ray fluorescence holograms of ZnSe and
Zn
0.74
Mn
0.2
Be
0.06
Se single crystals were measured by
means of a table-top laboratory setup. Holograms were recorded
simultaneously for Zn K, Se K and, in the case of the
mixed crystal, for Mn K X-ray fluorescence. Analysis of the
holograms was based on a linear regression algorithm preceded by the
matrix effects correction. It enabled the determination of real and
imaginary parts of the structure factors from which atomic structures
around different fluorescing atoms could be reconstructed. In
particular, direct imaging of Mn lattice sites in
Zn
0.74
Mn
0.2
Be
0.06
Se unambiguously demonstrated that
the majority of Mn atoms occupy substitutional Zn
positions. However, it was shown that the precise analysis of
Mn lattice site distribution can be hindered due to extinction
effects which have to be included in the analysis of XFH in the case
of non-centrosymmetric samples.