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Structure model of γ-Al(2)O(3) based on planar defects

The defect structure of γ-Al(2)O(3) derived from boehmite was investigated using a combination of selected-area electron diffraction (SAED) and powder X-ray diffraction (XRD). Both methods confirmed a strong dependence of the diffraction line broadening on the diffraction indices known from literatu...

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Autores principales: Rudolph, Martin, Motylenko, Mykhaylo, Rafaja, David
Formato: Online Artículo Texto
Lenguaje:English
Publicado: International Union of Crystallography 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6327185/
https://www.ncbi.nlm.nih.gov/pubmed/30713709
http://dx.doi.org/10.1107/S2052252518015786
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author Rudolph, Martin
Motylenko, Mykhaylo
Rafaja, David
author_facet Rudolph, Martin
Motylenko, Mykhaylo
Rafaja, David
author_sort Rudolph, Martin
collection PubMed
description The defect structure of γ-Al(2)O(3) derived from boehmite was investigated using a combination of selected-area electron diffraction (SAED) and powder X-ray diffraction (XRD). Both methods confirmed a strong dependence of the diffraction line broadening on the diffraction indices known from literature. The analysis of the SAED patterns revealed that the dominant structure defects in the spinel-type γ-Al(2)O(3) are antiphase boundaries located on the lattice planes [Image: see text], which produce the sublattice shifts [Image: see text]. Quantitative information about the defect structure of γ-Al(2)O(3) was obtained from the powder XRD patterns. This includes mainly the size of γ-Al(2)O(3) crystallites and the density of planar defects. The correlation between the density of the planar defects and the presence of structural vacancies, which maintain the stoichiometry of the spinel-type γ-Al(2)O(3), is discussed. A computer routine running on a fast graphical processing unit was written for simulation of the XRD patterns. This routine calculates the atomic positions for a given kind and density of planar defect, and simulates the diffracted intensities with the aid of the Debye scattering equation.
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spelling pubmed-63271852019-02-01 Structure model of γ-Al(2)O(3) based on planar defects Rudolph, Martin Motylenko, Mykhaylo Rafaja, David IUCrJ Research Papers The defect structure of γ-Al(2)O(3) derived from boehmite was investigated using a combination of selected-area electron diffraction (SAED) and powder X-ray diffraction (XRD). Both methods confirmed a strong dependence of the diffraction line broadening on the diffraction indices known from literature. The analysis of the SAED patterns revealed that the dominant structure defects in the spinel-type γ-Al(2)O(3) are antiphase boundaries located on the lattice planes [Image: see text], which produce the sublattice shifts [Image: see text]. Quantitative information about the defect structure of γ-Al(2)O(3) was obtained from the powder XRD patterns. This includes mainly the size of γ-Al(2)O(3) crystallites and the density of planar defects. The correlation between the density of the planar defects and the presence of structural vacancies, which maintain the stoichiometry of the spinel-type γ-Al(2)O(3), is discussed. A computer routine running on a fast graphical processing unit was written for simulation of the XRD patterns. This routine calculates the atomic positions for a given kind and density of planar defect, and simulates the diffracted intensities with the aid of the Debye scattering equation. International Union of Crystallography 2019-01-01 /pmc/articles/PMC6327185/ /pubmed/30713709 http://dx.doi.org/10.1107/S2052252518015786 Text en © Martin Rudolph et al. 2019 http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.http://creativecommons.org/licenses/by/4.0/
spellingShingle Research Papers
Rudolph, Martin
Motylenko, Mykhaylo
Rafaja, David
Structure model of γ-Al(2)O(3) based on planar defects
title Structure model of γ-Al(2)O(3) based on planar defects
title_full Structure model of γ-Al(2)O(3) based on planar defects
title_fullStr Structure model of γ-Al(2)O(3) based on planar defects
title_full_unstemmed Structure model of γ-Al(2)O(3) based on planar defects
title_short Structure model of γ-Al(2)O(3) based on planar defects
title_sort structure model of γ-al(2)o(3) based on planar defects
topic Research Papers
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6327185/
https://www.ncbi.nlm.nih.gov/pubmed/30713709
http://dx.doi.org/10.1107/S2052252518015786
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