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)
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.
|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|
|Resource URI:||https://kar.kent.ac.uk/id/eprint/15522 (The current URI for this page, for reference purposes)|