TY  - JOUR
A1  - Nolze, Gert
A1  - Tokarski, Tomasz
A1  - Rychłowski, Łukasz
T1  - Use of electron backscatter diffraction patterns to determine the crystal lattice. Part 2. Offset corrections
Y1  - 2023-02-24
VL  - 56
IS  - 2
SP  - 361
EP  - 366
JF  - Journal of Applied Crystallography
DO  - 10.1107/S1600576723000146
PB  - International Union of Crystallography
N2  - 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.
N2  - 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.
UR  - http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/10900
ER  -