Marcus, M.A. and Fakra, S. and Westphal, A.J. and Snead, C.J. and Keller, L.P. and Kearsley, A.T. and Burchell, M.J. (2008) Smelting of Fe-bearing glass during hypervelocity capture in aerogel. Meteoritics & Planetary Science, 43 (1-2). pp. 87-96. ISSN 1086-9379.
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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.
|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:||24 Jul 2012 14:58|
|Resource URI:||http://kar.kent.ac.uk/id/eprint/15522 (The current URI for this page, for reference purposes)|
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