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Stardust Interstellar Preliminary Examination VIII: Identification of crystalline material in two interstellar candidates

Gainsforth, Zack, Brenker, Frank E., Simionovici, Alexandre S., Schmitz, Sylvia, Burghammer, Manfred, Butterworth, Anna L., Cloetens, Peter, Lemelle, Laurence, Tresserras, Juan-Angel Sans, Schoonjans, Tom, and others. (2013) Stardust Interstellar Preliminary Examination VIII: Identification of crystalline material in two interstellar candidates. Meteoritics & Planetary Science, 49 (9). pp. 1645-1665. ISSN 1086-9379. (doi:10.1111/maps.12148) (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) (KAR id:59970)

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. (Contact us about this Publication)
Official URL
http://doi.org/10.1111/maps.12148

Abstract

Using synchrotron-based X-ray diffraction measurements, we identified crystalline material in two particles of extraterrestrial origin extracted from the Stardust Interstellar Dust Collector. The first particle, I1047,1,34 (Hylabrook), consisted of a mosaiced olivine grain approximately 1 µm in size with internal strain fields up to 0.3%. The unit cell dimensions were a = 4.85 ± 0.08 Å, b = 10.34 ± 0.16 Å, c = 6.08 ± 0.13 Å (2?). The second particle, I1043,1,30 (Orion), contained an olivine grain ? 2 µm in length and >500 nm in width. It was polycrystalline with both mosaiced domains varying over ? 20math formula and additional unoriented domains, and contained internal strain fields < 1%. The unit cell dimensions of the olivine were a = 4.76 ± 0.05 Å, b = 10.23 ± 0.10 Å, c = 5.99 ± 0.06 Å (2?), which limited the olivine to a forsteritic composition math formula (2?). Orion also contained abundant spinel nanocrystals of unknown composition, but unit cell dimension a = 8.06 ± 0.08 Å (2?). Two additional crystalline phases were present and remained unidentified. An amorphous component appeared to be present in both these particles based on STXM and XRF results reported elsewhere.

Item Type: Article
DOI/Identification number: 10.1111/maps.12148
Divisions: Faculties > Sciences > School of Physical Sciences
Depositing User: Mark Burchell
Date Deposited: 20 Jan 2017 15:14 UTC
Last Modified: 01 Aug 2019 10:41 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/59970 (The current URI for this page, for reference purposes)
Burchell, Mark J.: https://orcid.org/0000-0002-2680-8943
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