Differentiating the role of lithium and oxygen in retaining deuterium on lithiated graphite plasma-facing components

C. N. Taylor, J. P. Allain, K. E. Luitjohan, P. S. Krstic, J. Dadras, C. H. Skinner

Research output: Research - peer-reviewArticle

Abstract

Laboratory experiments have been used to investigate the fundamental interactions responsible for deuterium retention in lithiated graphite. Oxygen was found to be present and play a key role in experiments that simulated NSTX lithium conditioning, where the atomic surface concentration can increase to >40% when deuterium retention chemistry is observed. Quantum-classical molecular dynamic simulations elucidated this oxygen-deuterium effect and showed that oxygen retains significantly more deuterium than lithium in a simulated matrix with 20% lithium, 20% oxygen, and 60% carbon. Simulations further show that deuterium retention is even higher when lithium is removed from the matrix. Experiments artificially increased the oxygen content in graphite to ∼16% and then bombarded with deuterium. X-ray photoelectron spectroscopy showed depletion of the oxygen and no enhanced deuterium retention, thus demonstrating that lithium is essential in retaining the oxygen that thereby retains deuterium.

LanguageEnglish (US)
Article number057101
JournalPhysics of Plasmas
Volume21
Issue number5
DOIs
StatePublished - 2014

Fingerprint

retaining
deuterium
graphite
lithium
oxygen
matrices
simulation
conditioning
depletion
photoelectron spectroscopy
chemistry
molecular dynamics
carbon
x rays
interactions

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Taylor, C. N., Allain, J. P., Luitjohan, K. E., Krstic, P. S., Dadras, J., & Skinner, C. H. (2014). Differentiating the role of lithium and oxygen in retaining deuterium on lithiated graphite plasma-facing components. Physics of Plasmas, 21(5), [057101]. DOI: 10.1063/1.4874340

Differentiating the role of lithium and oxygen in retaining deuterium on lithiated graphite plasma-facing components. / Taylor, C. N.; Allain, J. P.; Luitjohan, K. E.; Krstic, P. S.; Dadras, J.; Skinner, C. H.

In: Physics of Plasmas, Vol. 21, No. 5, 057101, 2014.

Research output: Research - peer-reviewArticle

Taylor, C. N. ; Allain, J. P. ; Luitjohan, K. E. ; Krstic, P. S. ; Dadras, J. ; Skinner, C. H./ Differentiating the role of lithium and oxygen in retaining deuterium on lithiated graphite plasma-facing components. In: Physics of Plasmas. 2014 ; Vol. 21, No. 5.
@article{4c36e5b8886749a79aa39194b54d3950,
title = "Differentiating the role of lithium and oxygen in retaining deuterium on lithiated graphite plasma-facing components",
abstract = "Laboratory experiments have been used to investigate the fundamental interactions responsible for deuterium retention in lithiated graphite. Oxygen was found to be present and play a key role in experiments that simulated NSTX lithium conditioning, where the atomic surface concentration can increase to >40% when deuterium retention chemistry is observed. Quantum-classical molecular dynamic simulations elucidated this oxygen-deuterium effect and showed that oxygen retains significantly more deuterium than lithium in a simulated matrix with 20% lithium, 20% oxygen, and 60% carbon. Simulations further show that deuterium retention is even higher when lithium is removed from the matrix. Experiments artificially increased the oxygen content in graphite to ∼16% and then bombarded with deuterium. X-ray photoelectron spectroscopy showed depletion of the oxygen and no enhanced deuterium retention, thus demonstrating that lithium is essential in retaining the oxygen that thereby retains deuterium.",
author = "Taylor, {C. N.} and Allain, {J. P.} and Luitjohan, {K. E.} and Krstic, {P. S.} and J. Dadras and Skinner, {C. H.}",
year = "2014",
doi = "10.1063/1.4874340",
volume = "21",
journal = "Physics of Plasmas",
issn = "1070-664X",
publisher = "American Institute of Physics Publising LLC",
number = "5",

}

TY - JOUR

T1 - Differentiating the role of lithium and oxygen in retaining deuterium on lithiated graphite plasma-facing components

AU - Taylor,C. N.

AU - Allain,J. P.

AU - Luitjohan,K. E.

AU - Krstic,P. S.

AU - Dadras,J.

AU - Skinner,C. H.

PY - 2014

Y1 - 2014

N2 - Laboratory experiments have been used to investigate the fundamental interactions responsible for deuterium retention in lithiated graphite. Oxygen was found to be present and play a key role in experiments that simulated NSTX lithium conditioning, where the atomic surface concentration can increase to >40% when deuterium retention chemistry is observed. Quantum-classical molecular dynamic simulations elucidated this oxygen-deuterium effect and showed that oxygen retains significantly more deuterium than lithium in a simulated matrix with 20% lithium, 20% oxygen, and 60% carbon. Simulations further show that deuterium retention is even higher when lithium is removed from the matrix. Experiments artificially increased the oxygen content in graphite to ∼16% and then bombarded with deuterium. X-ray photoelectron spectroscopy showed depletion of the oxygen and no enhanced deuterium retention, thus demonstrating that lithium is essential in retaining the oxygen that thereby retains deuterium.

AB - Laboratory experiments have been used to investigate the fundamental interactions responsible for deuterium retention in lithiated graphite. Oxygen was found to be present and play a key role in experiments that simulated NSTX lithium conditioning, where the atomic surface concentration can increase to >40% when deuterium retention chemistry is observed. Quantum-classical molecular dynamic simulations elucidated this oxygen-deuterium effect and showed that oxygen retains significantly more deuterium than lithium in a simulated matrix with 20% lithium, 20% oxygen, and 60% carbon. Simulations further show that deuterium retention is even higher when lithium is removed from the matrix. Experiments artificially increased the oxygen content in graphite to ∼16% and then bombarded with deuterium. X-ray photoelectron spectroscopy showed depletion of the oxygen and no enhanced deuterium retention, thus demonstrating that lithium is essential in retaining the oxygen that thereby retains deuterium.

UR - http://www.scopus.com/inward/record.url?scp=84899750487&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84899750487&partnerID=8YFLogxK

U2 - 10.1063/1.4874340

DO - 10.1063/1.4874340

M3 - Article

VL - 21

JO - Physics of Plasmas

T2 - Physics of Plasmas

JF - Physics of Plasmas

SN - 1070-664X

IS - 5

M1 - 057101

ER -