Deuterium trapping by impurities in copper
The addition of Er, Zr, or Ti to copper provides trapping sites for hydrogen isotopes, which causes the apparent diffusivity of hydrogen to take on values that are smaller than its normal diffusivity in pure copper. This apparent diffusivity can be described in terms of the dopant concentration and the binding energy of the hydrogen isotope to the traps. Criteria are met that enable the results of permeation breakthrough measurements, which were made between 300/sup 0/ and 700 /sup 0/C, to be extrapolated to room temperature. The resultant lag-time for deuterium breakthrough for a 0.25-mm-thick membrane of Cu containing 0.88 at.% Er, for example, exceeds 1000 years at 25 /sup 0/C. Therefore, this alloy is suitable for use in vacuum enclosures where it is necessary to restrict hydrogen permeation for long periods of time. Thermodesorption measurements for samples that were exposed to deuterium reveal that there are two types of traps in these alloys, and demonstrate that deuterium-to-dopant atomic ratios approaching two can be obtained.
- Research Organization:
- Applied Physics Division, 2563, Sandia National Laboratories, Albuquerque, New Mexico 87185
- OSTI ID:
- 5458194
- Journal Information:
- J. Vac. Sci. Technol.; (United States), Vol. 20:4
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COPPER BASE ALLOYS
PERMEABILITY
SORPTIVE PROPERTIES
TRAPPING
DEUTERIUM
DESORPTION
DIFFUSION
BINDING ENERGY
EUROPIUM ADDITIONS
HIGH TEMPERATURE
IMPURITIES
MEDIUM TEMPERATURE
MEMBRANES
TITANIUM ADDITIONS
VACUUM SYSTEMS
ZIRCONIUM ADDITIONS
ALLOYS
COPPER ALLOYS
ENERGY
EUROPIUM ALLOYS
HYDROGEN ISOTOPES
ISOTOPES
LIGHT NUCLEI
NUCLEI
ODD-ODD NUCLEI
RARE EARTH ADDITIONS
RARE EARTH ALLOYS
STABLE ISOTOPES
SURFACE PROPERTIES
TITANIUM ALLOYS
ZIRCONIUM ALLOYS
360104* - Metals & Alloys- Physical Properties