Surface chemistry and physics of deuterium retention in lithiated graphite

C. N. Taylor, J. P. Allain, B. Heim, P. S. Krstic, C. H. Skinner, H. W. Kugel

Research output: Contribution to journalArticle

Abstract

Lithium wall conditioning in TFTR, CDX-U, T-11M, TJ-II and NSTX is found to yield enhanced plasma performance manifest, in part, through improved deuterium particle control. X-ray photoelectron spectroscopy (XPS) experiments examine the affect of D irradiation on lithiated graphite and show that the surface chemistry of lithiated graphite after D ion bombardment (500 eV/amu) is fundamentally different from that of non-Li conditioned graphite. Instead of simple LiD bonding seen in pure liquid Li, graphite introduces additional complexities. XPS spectra show that Li-O-D (533.0 ± 0.6 eV) and Li-C-D (291.4 ± 0.6 eV) bonds, for a nominal Li dose of 2 μm, become "saturated" with D at fluences between 3.8 and 5.2 × 10 17 cm-2. Atomistic modeling indicate that Li-O-D-C interactions may be a result of multibody effects as opposed to molecular bonding.

Original languageEnglish (US)
Pages (from-to)S777-S780
JournalJournal of Nuclear Materials
Volume415
Issue number1 SUPPL
DOIs
StatePublished - Aug 1 2011

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

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    Taylor, C. N., Allain, J. P., Heim, B., Krstic, P. S., Skinner, C. H., & Kugel, H. W. (2011). Surface chemistry and physics of deuterium retention in lithiated graphite. Journal of Nuclear Materials, 415(1 SUPPL), S777-S780. https://doi.org/10.1016/j.jnucmat.2010.09.049