Smelting of Fe-bearing glass during hypervelocity capture in aerogel

Marcus, Matthew A. and Fakra, Sirine and Westphal, Andrew J. and Snead, Christopher J. and Keller, Lindsay P. and Kearsley, Anton T. and Burchell, Mark J. (2008) Smelting of Fe-bearing glass during hypervelocity capture in aerogel. Meteoritics & Planetary Science, 43 (1-2). pp. 87-96. ISSN 1086-9379. (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Hypervelocity capture of material in aeroget can expose particles to high transient temperatures. We tested some of the possible effects of capture by using a light-gas gun to shoot particles of basalt glass into aerogel at 6.1 km s(-1). Using synchrotron-based micro-X-ray absorption spectroscopy ( mu XAS), we find that the starting material, in which the Fe was trivalent, is chemically reduced to divalent. In addition, some fragments were chemically reduced so that they contained Fe-0 in a form spectroscopically consistent with a mixture of two forms of iron carbide (cohenite and haxonite). The carbon presumably originated from organic impurities in the aerogel. High-resolution transmission electron microscopy (HRTEM) imaging shows the presence of Fe-rich crystalline nanoparticles. A similar species has been found in actual Stardust material, suggesting that "smelting" effects occurred during capture and should be taken into account when interpreting data on Stardust samples.

Item Type: Article
Subjects: Q Science > QE Geology > QE515 Geochemistry
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User: Maureen Cook
Date Deposited: 12 May 2009 08:26
Last Modified: 30 Apr 2014 11:42
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