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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
energy
Investigation of silver and iodine transport through silicon carbide layers prepared for nuclear fuel element cladding
Journal of Nuclear Materials, Volume 410, No. 1-3, Year 2011
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Description
Transport of silver and iodine through polycrystalline SiC layers produced by PBMR (Pty) Ltd. for cladding of TRISO fuel kernels was investigated using Rutherford backscattering analysis and electron microscopy. Fluences of 2 × 1016 Ag+ cm-2 and 1 × 10 16 I+ cm-2 were implanted at room temperature, 350 °C and 600 °C with an energy of 360 keV, producing an atomic density of approximately 1.5% at the projected ranges of about 100 nm. The broadening of the implantation profiles and the loss of diffusors through the front surface during vacuum annealing at temperatures up to 1400 °C was determined. The results for room temperature implantations point to completely different transport mechanisms for silver and iodine in highly disordered silicon carbide. However, similar results are obtained for high temperature implantations, although iodine transport is much stronger influenced by lattice defects than is the case for silver. For both diffusors transport in well annealed samples can be described by Fickian grain boundary diffusion with no abnormal loss through the surface as would be expected from the presence of nano-pores and/or micro-cracks. At 1100 °C diffusion coefficients for silver and iodine are below our detection limit of 10-21 m2 s-1, while they increase into the 10-20 m2 s-1 range at 1300 °C. © 2011 Elsevier B.V. All rights reserved.
Authors & Co-Authors
Friedland, Erich
South Africa, Pretoria
University of Pretoria
van der Berg, Nic G.
South Africa, Pretoria
University of Pretoria
Malherbe, Johan B.
South Africa, Pretoria
University of Pretoria
Hancke, Jacobus J.
South Africa, Centurion
Pebble Bed Modular Reactor Pty Limited
Barry, John C.
South Africa, Centurion
Pebble Bed Modular Reactor Pty Limited
Wendler, Elke
Germany, Jena
Friedrich-schiller-universität Jena
Wesch, Werner
Germany, Jena
Friedrich-schiller-universität Jena
Statistics
Citations: 51
Authors: 7
Affiliations: 3
Identifiers
Doi:
10.1016/j.jnucmat.2010.12.243
ISSN:
00223115
Research Areas
Cancer