Multi-nuclear NMR study of polytype and defect distribution in neutron irradiated silicon carbide

Brigden, C. T. and Farnan, I. and Hania, P. R. (2014) Multi-nuclear NMR study of polytype and defect distribution in neutron irradiated silicon carbide. Journal of Nuclear Materials, 444 (1-3). pp. 92-100. ISSN 0022-3115 DOI 10.1016/j.jnucmat.2013.09.033

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Abstract

Silicon carbide containing 92% β-SiC has been irradiated in a material test reactor at a fast neutron fluence (>0.1 MeV) of 3.39 × 1021 n cm−2 at an average temperature of 796 °C, and subsequently studied by 29Si and 13C MAS NMR spectroscopy. A small amount of structural alteration was measured with the α-SiC polytypes increasing from around 8–14%. Based on the assumption that the primary dominant defect is the paramagnetic View the MathML source defect. The defect concentration has been measured in both the irradiated and unirradiated sample using spin lattice relaxation time (T1) data obtained via a saturation-recovery experiment and was found to increase from 4.6 × 1018 cm−3 to 1.5 × 1020 cm−3. A case is presented to show that a small residual internuclear dipolar coupling contribution (at 3.80 × 10−6% of its total value) towards the T1 in the unirradiated reference sample significantly modifies the relaxation time from a value based solely on the dominant nuclear defect coupling mechanism.

Item Type: Article
Additional Information: Corrigendum: To correct a formatting error and to eliminate any ambiguity, the sentence "A small amount ... from around 8–14%" in abstract should read ''A small amount of structural alteration was measured, with the α-SiC polytypes increasing from around 8% to 14%''.
Uncontrolled Keywords: 2013AREP; IA66;
Subjects: 99 - Other
Divisions: 99 - Other
Journal or Publication Title: Journal of Nuclear Materials
Volume: 444
Page Range: pp. 92-100
Identification Number: 10.1016/j.jnucmat.2013.09.033
Depositing User: Sarah Humbert
Date Deposited: 23 Dec 2013 18:23
Last Modified: 25 Aug 2014 21:36
URI: http://eprints.esc.cam.ac.uk/id/eprint/2941

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