Surface-limited release of deuterium from iron

Conference · Wed Jan 01 04:00:00 EST 1986

OSTI ID:5851099

Wampler, W R

The release of deuterium (D) from solution in iron was measured for conditions approaching a bare-metal surface on single crystal and polycrystalline samples sputter-cleaned in uhv. The release rate was found to be proportional to the square of the concentration of D in solution. The second-order kinetics show the release is limited by molecular recombination of D on the surface. The recombination coefficient (K) measured for clean surfaces can be described by K = K/sub 0/ exp(Q/sub K//kT) with K/sub 0/ = 10/sup -21/ cm/sup 4//s and Q/sub K/ = 0.69 +- 0.06 eV. These recombination coefficients are orders of magnitude larger than those previously reported for iron. A model for K is presented in which the rate limiting step is the recombination and desorption of D chemisorbed on the surface. The magnitude and temperature dependence of K predicted by the model are in good agreement with the measurements for iron. Controlled dosing of the samples with oxygen showed that submonolayer oxygen coverages cause large reductions in the D release rate.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5851099
• Report Number(s): SAND-85-2736C; CONF-860522-6; ON: DE86011420
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700209* -- Fusion Power Plant Technology-- Component Development & Materials Testing
ADSORPTION
DEUTERIUM
DOPED MATERIALS
ELEMENTS
HYDROGEN ISOTOPES
IRON
ISOTOPES
LIGHT NUCLEI
MATERIALS
METALS
NONMETALS
NUCLEI
ODD-ODD NUCLEI
OXYGEN
RECOMBINATION
RECYCLING
SORPTION
STABLE ISOTOPES
TRANSITION ELEMENTS