Citation link:
https://doi.org/10.26092/elib/10
copyright
Elucidating structural order and disorder phenomena in mullite-type Al 4 B 2 O 9 by automated electron diffraction tomography
File | Description | Size | Format | |
---|---|---|---|---|
122_Post.pdf | Postprint | 1.62 MB | Adobe PDF | View/Open |
Authors: | Zhao, Haishuang Krysiak, Yaşar Hoffmann, Kristin Barton, Bastian Molina-Luna, Leopoldo Neder, Reinhard Kleebe, Hans-Joachim Gesing, Thorsten M. Schneider, Hartmut Kolb, Ute Fischer, Reinhard X. |
Abstract: | The crystal structure and disorder phenomena of Al4B2O9, an aluminum borate from the mullite-type family, were studied using automated diffraction tomography (ADT), a recently established method for collection and analysis of electron diffraction data. Al4B2O9, prepared by sol-gel approach, crystallizes in the monoclinic space group C2/m. The ab initio structure determination based on three-dimensional electron diffraction data from single ordered crystals reveals that edge-connected AlO6 octahedra expanding along the b axis constitute the backbone. The ordered structure (A) was confirmed by TEM and HAADF-STEM images. Furthermore, disordered crystals with diffuse scattering along the b axis are observed. Analysis of the modulation pattern implies a mean superstructure (AAB) with a threefold b axis, where B corresponds to an A layer shifted by ½a and ½c. Diffraction patterns simulated for the AAB sequence including additional stacking disorder are in good agreement with experimental electron diffraction patterns. |
Keywords: | Electron diffraction; Aluminum borate, chemical synthesis, mullite-type structure, X-ray diffraction, NMR spectroscopy, thermal analysis; Crystal structure determination; Superstructure; Disorder | Issue Date: | May-2017 | Project: | Chemische Kristallographie fester Stoffe | Journal/Edited collection: | Journal of Solid State Chemistry | Start page: | 114 | End page: | 123 | Type: | Artikel/Aufsatz | ISSN: | 00224596 | Secondary publication: | no | DOI: | 10.26092/elib/10 | URN: | urn:nbn:de:gbv:46-elib42256 | Institution: | Universität Bremen | Faculty: | Fachbereich 02: Biologie/Chemie (FB 02) |
Appears in Collections: | Forschungsdokumente |
Page view(s)
257
checked on Jul 4, 2024
Download(s)
289
checked on Jul 4, 2024
Google ScholarTM
Check
Items in Media are protected by copyright, with all rights reserved, unless otherwise indicated.