TY - JOUR
T1 - Chemical and physical erosion of carbon and metallic substrates containing lithium during low-energy deuterium ion irradiation
AU - Nieto-Perez, M.
AU - Allain, J. P.
AU - Heim, B.
AU - Taylor, C. N.
N1 - Funding Information:
We thank Elizabeth Kendall for data analysis and typesetting, Prof. A. Hassanein for use of the IMPACT facility at Purdue University, Dr. Charles Skinner for insightful discussions and Matt Hendricks for experiments with ATJ0-X samples. ∗Work supported by USDOE Contracts DE-FG02-08ER54990 and DE-FG02-09ER55015.
PY - 2011/8/1
Y1 - 2011/8/1
N2 - Lithium deposition on Grade ATJ graphite substrates and metallic substrates under low-energy D2+ irradiation are compared. Transient and steady-state release rate of ejected species are measured for non-lithiated and lithiated ATJ graphite surfaces. Irradiation fluxes of order 1015 cm-2 s-1 exposed samples while ejected species are monitored with a line-of-sight quadrupole mass spectrometer. For lithiated ATJ graphite the dominant D emission channels are D2O and HDO and indicate the importance of lithium, water breakdown at the surface and oxide formation on desorption dynamics. Exponential decay in the transient release rate of ejected species is found for lithiated ATJ graphite, indicating that near surface super-saturation of D atoms at the vacuum interface in the presence of lithium atoms. In situ X-ray photoelectron spectroscopy (XPS) surface analysis corroborates this result. Lithium-coatings on Mo substrates demonstrate high sputtering rates; however depleted Li/Mo surfaces are quickly recovered when surfaces are heated to temperatures near 500 K.
AB - Lithium deposition on Grade ATJ graphite substrates and metallic substrates under low-energy D2+ irradiation are compared. Transient and steady-state release rate of ejected species are measured for non-lithiated and lithiated ATJ graphite surfaces. Irradiation fluxes of order 1015 cm-2 s-1 exposed samples while ejected species are monitored with a line-of-sight quadrupole mass spectrometer. For lithiated ATJ graphite the dominant D emission channels are D2O and HDO and indicate the importance of lithium, water breakdown at the surface and oxide formation on desorption dynamics. Exponential decay in the transient release rate of ejected species is found for lithiated ATJ graphite, indicating that near surface super-saturation of D atoms at the vacuum interface in the presence of lithium atoms. In situ X-ray photoelectron spectroscopy (XPS) surface analysis corroborates this result. Lithium-coatings on Mo substrates demonstrate high sputtering rates; however depleted Li/Mo surfaces are quickly recovered when surfaces are heated to temperatures near 500 K.
UR - http://www.scopus.com/inward/record.url?scp=80054834249&partnerID=8YFLogxK
U2 - 10.1016/j.jnucmat.2010.10.078
DO - 10.1016/j.jnucmat.2010.10.078
M3 - Artículo
AN - SCOPUS:80054834249
SN - 0022-3115
VL - 415
SP - S133-S136
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
IS - 1 SUPPL
ER -