On the Informativeness of X-Ray Diffraction Patterns in the Form of a Halo

We have assessed the informativeness of X-ray diffraction patterns in the form of a halo, characteristic of metallic alloys prepared by liquid quenching (melt spinning) (using an Fe 78 P 20 Si 2 alloy as an example) and oxide films grown on unheated substrates by ion beam sputtering of targets with...

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Bibliographic Details
Published in:Inorganic materials 2020-08, Vol.56 (8), p.859-866
Main Authors: Ievlev, V. M., Kannykin, S. V., Kostyuchenko, A. V., Belonogov, E. K., Putlyaev, V. I.
Format: Article
Language:English
Subjects:
Bonding strength
Chemistry
Chemistry and Materials Science
Coherent scattering
Computer simulation
Correlation analysis
Crystal structure
Crystallinity
Crystallites
Crystals
Diffraction patterns
Halos
Hydroxyapatite
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Ion beam sputtering
Ions
Lithium niobates
Materials Science
Melt spinning
Oxide coatings
Size effects
Substrates
X-ray diffraction
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Summary:We have assessed the informativeness of X-ray diffraction patterns in the form of a halo, characteristic of metallic alloys prepared by liquid quenching (melt spinning) (using an Fe 78 P 20 Si 2 alloy as an example) and oxide films grown on unheated substrates by ion beam sputtering of targets with an appropriate composition (LiNbO 3 and Ca 10 (PO 4 ) 6 (OH) 2 ). Simulation results for X-ray diffraction patterns of expected crystalline phases with allowance for the size effect in diffraction demonstrate that a model halo agrees well with the halos observed in X-ray diffraction patterns of the samples under study. Observed correlations lead us to conclude that, inherent in rather large crystals, coherence of elastically scattered waves is lost in the structures considered here because of the random mutual orientation of crystalline nuclei of the corresponding phases with ultimately small dimensions. For this reason, translational symmetry, limited by the ultimately small dimensions of mutually misoriented crystallites, is the most transparent characteristic of the nature of such (quasi-amorphous) structures for systems with strong interatomic bonding.
ISSN:0020-1685
1608-3172
DOI:10.1134/S0020168520080051