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Gaillot, A.-C., Drits, V. A., Veblen, D. R. & Lanson, B. (2011) Polytype and polymorph identification of finely divided aluminous dioctahedral mica individual crystals with SAED. Kinematical and dynamical electron diffraction. Phys. Chem. Miner. 38 435–448. 
Added by: Laurent Cournède (2016-03-10 21:32:20)
Type de référence: Article
DOI: 10.1007/s00269-011-0417-4
Numéro d'identification (ISBN etc.): 0342-1791
Clé BibTeX: Gaillot2011
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Catégories: ID2M
Mots-clés: celadonite, Cis-vacant, Dioctahedral mica, Dynamical diffraction, Electron diffraction, Illite, Kinematical approximation, late-stage diagenesis, montmorillonite, Muscovite, patterns, Polymorph, Polytype, solid-solutions, Trans-vacant, uranium deposits, x-ray-diffraction
Créateurs: Drits, Gaillot, Lanson, Veblen
Collection: Phys. Chem. Miner.
Consultations : 13/624
Indice de consultation : 3%
Indice de popularité : 0.75%
Résumé     
This work investigates the potential of selected-area electron diffraction (SAED) for the polytype and polymorph identification of finely divided K-bearing aluminous dioctahedral mica. Individual mica crystals may indeed differ by their layer-stacking sequence and by the inner structure of their octahedral sheets (polytypic and polymorphic variants, respectively). This diversity of natural mica is commonly considered to be responsible for their morphological variety. The present article thus analyzes the intensity distribution between hk0 beams as a function of the crystal structure and thickness. The comparison of ED calculations with experimental diffraction data shows that predicted dynamical effects are not observed for finely divided dioctahedral mica. The influence of different structure defects on calculated intensities is analyzed, and their widespread occurrence in natural mica is hypothesized to be responsible for the limitation of dynamical diffraction effects. SAED may thus be used to identify the structure of individual dioctahedral mica crystals using the kinematical approximation to simulate and qualitatively interpret the observed intensities.
Added by: Laurent Cournède  
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