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  4. Elucidating structural order and disorder phenomena in mullite-type Al 4 B 2 O 9 by automated electron diffraction tomography
 
Zitierlink DOI
10.26092/elib/10

Elucidating structural order and disorder phenomena in mullite-type Al 4 B 2 O 9 by automated electron diffraction tomography

Veröffentlichungsdatum
2017-05
Autoren
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.  
Zusammenfassung
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.
Schlagwörter
Electron diffraction

; 

Aluminum borate, chemical synthesis, mullite-type structure, X-ray diffraction, NMR spectroscopy, thermal analysis

; 

Crystal structure determination

; 

Superstructure

; 

Disorder
Institution
Universität Bremen  
Fachbereich
Fachbereich 02: Biologie/Chemie (FB 02)  
Dokumenttyp
Artikel/Aufsatz
Zeitschrift/Sammelwerk
Journal of Solid State Chemistry  
Startseite
114
Endseite
123
Zweitveröffentlichung
Nein
Sprache
Englisch
Dateien
Lade...
Vorschaubild
Name

122_Post.pdf

Description
Postprint
Size

1.59 MB

Format

Adobe PDF

Checksum

(MD5):e805c562236bf362c93a3b4d1233de3b

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