Tritium diffusion in nonmetallic solids of interest for fusion reactors. Annual progress report, June 1, 1974--August 1, 1975

Technical Report · Wed Jan 01 04:00:00 EST 1975

OSTI ID:4162003

Elleman, T

Tritium diffusion coefficients in selected metal oxides and carbides plus pyrolytic carbon have been measured by injecting tritium into specimens and measuring the time rate of tritium release during isothermal annealing. Release results were generally consistent with classical diffusion solutions and yielded diffusion coefficients characterized by a single-valued activation energy over the temperature range of measurement. The pyrolytic carbon results were unique in that tritium release was apparently controlled by surface desorption or exchange rather than diffusion. Measured diffusion coefficients were considerable lower than the literature values for metals at comparable temperatures, which suggests that metal oxides, carbides, or nitrides may be useful as tritium barriers in fusion systems. (auth)

• Research Organization: North Carolina State Univ., Raleigh (USA). Dept. of Nuclear Engineering
• NSA Number: NSA-33-001097
• OSTI ID: 4162003
• Report Number(s): ORO--4721-4
• Country of Publication: United States
• Language: English

Related Subjects

*ALUMINIUM OXIDES-- PERMEABILITY
*BERYLLIUM OXIDES-- PERMEABILITY
*PYROLYTIC CARBON-- PERMEABILITY
*SILICON CARBIDES-- PERMEABILITY
*TRITIUM-- DIFFUSION
*YTTRIUM OXIDES-- PERMEABILITY
360204* --Materials--Ceramics
Cermets & Refractories-- Physical Properties
ANNEALING
HIGH TEMPERATURE
ISOTHERMAL PROCESSES
N50130* --Metals
Ceramics
& Other Materials--Ceramics & Cermets--Properties
Structure & Phase Studies
POWDERS
RECOILS