Structural evolution in thermally processed silicates.

Details Structural evolution in thermally processed silicates. Structural evolution in thermally processed silicates.

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...308..309t&link_type=abstract

Astronomy and Astrophysics, v.308, p.309-320

Astronomy and Astrophysics

Astrophysics

9

Methods: Laboratory, Dust: Extinction, Infrared: General, Infrared: Solar System, X-Rays: General

Scientific paper

The long and short range structure of thermally processed Mg and Fe silicate powders have been investigated using the techniques of powder diffraction and X-ray absorption spectroscopy on the SERC Daresbury Laboratory Synchrotron Radiation Source. We find the silicates' long-range structure to be divided into two groupings, dependent upon the cation population (Mg-only-bearing and Fe-bearing samples), irrespective of general stoichiometric composition. Over short length scales, the tetrahedral structural units are stable, well defined and unaffected by annealing. Disorder arises from their arrangement and connectivity. Mg and Fe appear to possess different network modifying properties, allowing recrystallized Fe-bearing silicates to retain some structural signature of their low temperature amorphous origin. The primitive structures frozen in at the point of formation serve as centres for further recrystallization, while those silicates containing no Fe undergo a complete phase change, erasing any initial structure. Results are discussed in terms of the known spectroscopic properties of silicate dust analogue materials.

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