Surface chemistry and physics of deuterium retention in lithiated graphite
Abstract
Lithium wall conditioning in TFTR, CDX-U, T-11M, 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 mu m, become "saturated" with D at fluences between 3.8 and 5.2 x 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. (C) 2010 Elsevier B.V. All rights reserved.
Keywords
LITHIUM
DOI
10.1016/j.jnucmat.2010.09.049
Citation
Journal of Nuclear Materials Volume 415, Issue 1, Supplement, 1 August 2011, Pages S777–S780
Date of this Version
8-1-2011
Recommended Citation
Taylor, C. N.; Allain, Jean Paul; Heim, B.; Krstic, P. S.; Skinner, C. H.; and Kugel, H. W., "Surface chemistry and physics of deuterium retention in lithiated graphite" (2011). Birck and NCN Publications. Paper 974.
http://dx.doi.org/10.1016/j.jnucmat.2010.09.049