Reaction probability for exchange of hydrogen isotopes on palladium
- Oak Ridge Y-12 Plant, Martin Marietta Energy Systems, Inc., Oak Ridge, Tennessee 37831-8096 (United States)
Surface conductances measured for the diffusion of hydrogen in palladium have been used to calculate the probability, as a function of temperature, pressure, and hydrogen isotope, that a H, D, or T atom will enter bulk Pd as a result of a collision of a H{sub 2}, D{sub 2}, or T{sub 2} molecule with the Pd surface. This low probability is attributed to hydrogen penetrating a surface hydride phase under the driving force of the chemical potential of the gas consistent with the process having the exchange coefficient of the bulk material. These results were in good agreement with published experimental observations near 300 K and 100 kPa hydrogen pressure for D-H and H-D exchange. These exchange-probability calculations predict an isotope effect that inverts at elevated temperatures and, with decreasing temperature and increasing pressure, a marked decrease in the exchange probability.
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5005002
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 45:8; ISSN PRBMD; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360104* -- Metals & Alloys-- Physical Properties
ATOM COLLISIONS
ATOM TRANSPORT
ATOM-MOLECULE COLLISIONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
COLLISIONS
DEUTERIUM
DIFFUSION
DISSOCIATION
ELEMENTS
HYDROGEN
HYDROGEN ISOTOPES
ISOTOPES
ISOTOPIC EXCHANGE
KINETICS
LIGHT NUCLEI
LOW PRESSURE
METALS
MOLECULE COLLISIONS
NEUTRAL-PARTICLE TRANSPORT
NONMETALS
NUCLEI
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
PALLADIUM
PLATINUM METALS
PRESSURE DEPENDENCE
RADIATION TRANSPORT
RADIOISOTOPES
REACTION KINETICS
STABLE ISOTOPES
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0273-0400 K
TRANSITION ELEMENTS
TRITIUM
YEARS LIVING RADIOISOTOPES