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The effect of beryllium oxide on retention in JET ITER-like wall tiles

JET Contributors; Makepeace, C.; Pardanaud, C.; Roubin, P.; Borodkina, I.; Ayres, C.; Coad, P.; Baron-Wiechec, A.; Jepu, I.; Heinola, K.; Widdowson, A.; Lozano-Perez, S.; Abduallev, S.; Abhangi, M.; Abreu, P.; Afzal, M.; Aggarwal, K. M.; Ahlgren, T.; Ahn, J. H.; Aho-Mantila, L.; Aiba, N.; ... mehr

Abstract:
Preliminary results investigating the microstructure, bonding and effect of beryllium oxide formation on retention in the JET ITER-like wall beryllium tiles, are presented. The tiles have been investigated by several techniques: Scanning Electron Microscopy (SEM) equipped with Energy Dispersive X-ray (EDX), Transmission Electron microscopy (TEM) equipped with EDX and Electron Energy Loss Spectroscopy (EELS), Raman Spectroscopy and Thermal Desorption Spectroscopy (TDS). This paper focuses on results from melted materials of the dump plate tiles in JET. From our results and the literature, it is concluded, beryllium can form micron deep oxide islands contrary to the nanometric oxides predicted under vacuum conditions. The deepest oxides analyzed were up to 2-micron thicknesses. The beryllium Deuteroxide (BeOxDy) bond was found with Raman Spectroscopy. Application of EELS confirmed the oxide presence and stoichiometry. Literature suggests these oxides form at temperatures greater than 700 °C where self-diffusion of beryllium ions through the surface oxide layer can occur. Further oxidation is made possible between oxygen plasma impurities and the beryllium ions now present at the wall surface. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000119818
Veröffentlicht am 28.05.2020
Originalveröffentlichung
DOI: 10.1016/j.nme.2019.02.022
Scopus
Zitationen: 8
Web of Science
Zitationen: 6
Dimensions
Zitationen: 8
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Thermofluidik (IATF)
Institut für Technische Physik (ITEP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 05.2019
Sprache Englisch
Identifikator ISSN: 2352-1791
KITopen-ID: 1000119818
Erschienen in Nuclear materials and energy
Verlag Elsevier
Band 19
Seiten 346-351
Nachgewiesen in Dimensions
Web of Science
Scopus
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