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The deuterium release behaviour in gamma ray-irradiated candidate breeder ceramics

Carella, E.; Morono, A.; Gonzalez, M.; Kolb, M.H.H.; Knitter, R.

Abstract:
The work summarizes the obtained results on deuterium absorption and thermal induced desorption experiments performed on ceramic breeder candidate compositions. To simulate tritium (T) residence time (or T diffusion) in a DEMO-like ionizing environment, gas sorption­ desorption experiments of deuterium (another H isotope) during ionizing radiation in breeder ceramics were proposed as an alternative method to validate the functional properties of tritium breeder materials in the Helium Cooled Pebble Bed (HCPB) breeder-blanket concept. Pellet- and pebble-shaped samples of lithium orthosilicate and lithium metatitanate compositions were exposed to 1 mbar D2 atmosphere while being irradiated up to 4 MGy gamma-ray ionizing radiation. Then, the D2 desorbed rate signal was followed by mass spectroscopy as a function of temperature up to 800 "C and a temperature rate of 10 K/min for pebbles and pellets samples. From the experimental desorption curves and the calculated activation energies, discussion on the involved D2 trapping centres were obtained. D2 seems to be trapped in defects common to lithium orthosilicate and metatitanate cry ... mehr


Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Keramische Werkstoffe und Technologien (IAM-KWT)
Publikationstyp Vortrag
Jahr 2015
Sprache Englisch
Identifikator KITopen ID: 230102713
HGF-Programm 31.03.06; LK 01
Erschienen in 18th International Workshop of Ceramic Breeder Blanket Interactions (CBBI-18), Jeju, Korea, September 10-12, 2015
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