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. (doi:https://doi.org/10.1111/j.1945-5100.2008.tb00611.x) (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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Official URL http://dx.doi.org/10.1111/j.1945-5100.2008.tb00611... |
Abstract
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 |
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Subjects: | Q Science > QE Geology > QE515 Geochemistry |
Divisions: | Faculties > Sciences > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences |
Depositing User: | Maureen Cook |
Date Deposited: | 12 May 2009 08:26 UTC |
Last Modified: | 30 Apr 2014 11:42 UTC |
Resource URI: | https://kar.kent.ac.uk/id/eprint/15522 (The current URI for this page, for reference purposes) |
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