Surface-limited release of deuterium from tantalum
- Sandia National Laboratories, Albuquerque, New Mexico 87185-5800 (US)
The release of deuterium (D) from solution in tantalum (Ta) was examined. Nuclear reaction analysis was used to measure the concentration of D in solution during isothermal release of the D. The rate-controlling process for D release was molecular recombination at the surface. The release followed second-order kinetics, which shows that the recombination occurs from sites which have a binding energy for the D less than or equal to the energy of solution. Recombination therefore cannot be occurring from the more strongly bound low-coverage chemisorption sites. A model for the release rate which uses no free parameters is described. Experimentally determined recombination coefficients for Ta, Pd, and Fe spanning 18 orders of magnitude are in good agreement with the model.
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6260641
- Journal Information:
- Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 69:5; ISSN 0021-8979; ISSN JAPIA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360104* -- Metals & Alloys-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400101 -- Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures
CHEMICAL ANALYSIS
DESORPTION
DEUTERIUM
ELEMENTS
FOILS
HYDROGEN ISOTOPES
IMPURITIES
ISOTOPES
LIGHT NUCLEI
METALS
NUCLEAR REACTION ANALYSIS
NUCLEI
ODD-ODD NUCLEI
SORPTIVE PROPERTIES
SPUTTERING
STABLE ISOTOPES
SURFACE PROPERTIES
TANTALUM
TEMPERATURE DEPENDENCE
TRANSITION ELEMENTS