Sampling statistics of diffraction from nanoparticle powder aggregates

Sampling statistics of diffraction from nanoparticle powder aggregates

In this study, the sampling statistics of X‐ray diffraction data obtained from polycrystalline nanopowders are studied through analytical formulations and numerical modelling. It is shown that the very large acceptance angles of crystalline nanoparticles can cause issues in computing the number of d...

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Veröffentlicht in:Journal of Applied Crystallography 2014-06, Vol.47 (3), p.1016-1025
Hauptverfasser: Öztürk, Hande, Yan, Hanfei, Hill, John P., Noyan, Ismail C.
Format: Artikel
Sprache:eng
Schlagworte:
Aggregates
Coherent scattering
Crystal structure
Crystallography
Debye equation
Diffraction
Grains
MATERIALS SCIENCE
Mathematical models
Nanoparticles
Nanostructure
Polycrystals
powder diffraction
Sampling
Scattering
Statistics
X-rays
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Beschreibung
Zusammenfassung:In this study, the sampling statistics of X‐ray diffraction data obtained from polycrystalline nanopowders are studied through analytical formulations and numerical modelling. It is shown that the very large acceptance angles of crystalline nanoparticles can cause issues in computing the number of diffracting grains scattering into a given Bragg reflection. These results intimate that formulations previously tested and verified for polycrystalline aggregates with grains larger than 500 nm should be revalidated for particles with coherent scattering lengths below 10 nm.
ISSN:1600-5767
0021-8898
1600-5767
DOI:10.1107/S1600576714008528