Abstract
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.
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Notes
Electron Microscopy Suite, Java version (JEMS). http://cimewww.epfl.ch/people/stadelmann/jemswebsite/jems.html.
MacTempas package from Total Resolution LLC. http://www.totalresolution.com/.
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Acknowledgments
This work was supported by a NSF grant #EAR0409071 (ACG, and DRV) and a Lavoisier fellowship (French Ministry of Foreign Affairs) to ACG. VAD thanks the Russian Foundation for Basic Research for financial support. Daniel Beaufort (Hydr’Asa, Poitiers—France) and Roar Kilaas (Total Resolution, Berkeley—USA) are thanked for providing the mica samples and for valuable discussions about the MacTempas software, respectively. Alain Baronnet (CINaM, Marseille—France) and Ken Livi (JHU, Baltimore—USA) are thanked for providing TEM access, assistance, and for fruitful discussions. The present version of the article benefited from the constructive comments of three anonymous reviewers.
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Gaillot, AC., Drits, V.A., Veblen, D.R. et al. Polytype and polymorph identification of finely divided aluminous dioctahedral mica individual crystals with SAED. Kinematical and dynamical electron diffraction. Phys Chem Minerals 38, 435–448 (2011). https://doi.org/10.1007/s00269-011-0417-4
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DOI: https://doi.org/10.1007/s00269-011-0417-4