Abstract
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 Fe78P20Si2 alloy as an example) and oxide films grown on unheated substrates by ion beam sputtering of targets with an appropriate composition (LiNbO3 and Ca10(PO4)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.
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Notes
Russian Foundation for Basic Research, grant no. 17-03-01140 A.
Russian Foundation for Basic Research, grant no. 18-29-11062.
One example of such summation of extremely small volumes of coherently scattering space is epitaxial films in a discrete nucleation step.
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ACKNOWLEDGMENTS
In this research, we used equipment at the Shared Research Facilities Center, Voronezh State University.
Funding
This work was supported by the Russian Foundation for Basic Research, grant nos. 17-03-01140 A (investigation of Fe78P20Si2 amorphous alloys) and 18-29-11062 (investigation of LiNbO3 films).
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Ievlev, V.M., Kannykin, S.V., Kostyuchenko, A.V. et al. On the Informativeness of X-Ray Diffraction Patterns in the Form of a Halo. Inorg Mater 56, 859–866 (2020). https://doi.org/10.1134/S0020168520080051
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DOI: https://doi.org/10.1134/S0020168520080051