ISSN:
1600-5724
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Chemistry and Pharmacology
,
Geosciences
,
Physics
Notes:
The feasibility of direct structure imaging of pyroxenoid chain silicates by high-resolution electron microscopy at 500 kV is demonstrated both experimentally and theoretically for the minerals wollastonite, CaSiO3, and rhodonite, MnSiO3. Image simulations with a simplified multi-slice approach indicated that the crystal projection most suitable for direct observation of the tetrahedral chain arrangement corresponded to the overlap of the metal cations with the tetrahedral sites, a situation which occurs in all pyroxenoids. Electron micrographs were also obtained, with bright- field axial illumination at 500 kV, which could be closely matched with the simulated images, at least for very thin crystal regions. The implications of these results, in particular for studies at the atomic level of solid-state transformations involving the pyroxenoids, are briefly discussed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0567739481000673
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