Nolze, Gert
[VerfasserIn];
Tokarski, Tomasz
[VerfasserIn];
Rychłowski, Łukasz
[VerfasserIn];
3AGH University of Science and TechnologyAcademic Centre for Materials and NanotechnologyMickiewicza 30 Krakow 30-059 Poland
[VerfasserIn]
Use of electron backscatter diffraction patterns to determine the crystal lattice. Part 2. Offset corrections
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Medientyp:
E-Artikel
Titel:
Use of electron backscatter diffraction patterns to determine the crystal lattice. Part 2. Offset corrections
Beteiligte:
Nolze, Gert
[VerfasserIn];
Tokarski, Tomasz
[VerfasserIn];
Rychłowski, Łukasz
[VerfasserIn];
3AGH University of Science and TechnologyAcademic Centre for Materials and NanotechnologyMickiewicza 30 Krakow 30-059 Poland
[VerfasserIn]
Erschienen:
International Union of Crystallography; 5 Abbey Square, Chester, Cheshire CH1 2HU, England, 2023-02-24
Anmerkungen:
Diese Datenquelle enthält auch Bestandsnachweise, die nicht zu einem Volltext führen.
Beschreibung:
A band width determination using the first derivative of the band profile systematically underestimates the true Bragg angle. Corrections are proposed to compensate for the resulting offset Δa/a of the mean lattice parameters derived from as many Kikuchi band widths as possible. For dynamically simulated Kikuchi patterns, Δa/a can reach up to 8% for phases with a high mean atomic number Z, whereas for much more common low‐Z materials the offset decreases linearly. A predicted offset Δa/a = f(Z) is therefore proposed, which also includes the unit‐cell volume and thus takes into account the packing density of the scatterers in the material. Since Z is not always available for unknown phases, its substitution by Zmax, i.e. the atomic number of the heaviest element in the compound, is still acceptable for an approximate correction. For simulated Kikuchi patterns the offset‐corrected lattice parameter deviation is Δa/a < 1.5%. The lattice parameter ratios, and the angles α, β and γ between the basis vectors, are not affected at all. ; Automatically determined band widths in simulated backscatter Kikuchi patterns exhibit differences from the double Bragg angles that correlate with the scatterer density. Corrections are proposed to compensate for this.