Aging effects in palladium and LaNi sub 4. 25 Al sub 0. 75 tritides

Conference · Tue Jan 01 04:00:00 EST 1991

OSTI ID:5785903

Nobile, A; Wermer, J R; Walters, R T

Palladium and LaNi{sub 5-x}Al{sub x} (x=0.30, 0.75, 0.85), which form reversible hydrides, are used for tritium processing and storage in the Savannah River Site (SRS) tritium facilities. As part of a program to develop technology based on the use of reversible metal hydrides for tritium processing and storage, the effects of aging on the thermodynamic behavior of palladium and LaNi{sub 4.25}Al{sub 0. 75} tritides are under investigation. During aging, the {sup 3}He tritium decay product remains in the tritide lattice and changes the thermodynamics of the tritium-metal tritide system. Aging effects in 755-day-aged palladium and 1423-day-aged LaNi{sub 4.25}Al{sub 0.75} tritides will be reported. Changes in the thermodynamics were determined by measuring tritium desorption isotherms on aging samples. In palladium, aging decreases the desorption isotherm plateau pressure and changes the {alpha}-phase portion of the isotherm. Aging-induced changes in desorption isotherms are more drastic in LaNi{sub 4.25}Al{sub 0.75}. Among the changes noted are: (1) decreased isotherm plateau pressure, (2) increased isotherm plateau slope, and (3) appearance of deep-trapped tritium, removable only by exchange with deuterium.

• Research Organization: Westinghouse Savannah River Co., Aiken, SC (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC09-89SR18035
• OSTI ID: 5785903
• Report Number(s): WSRC-MS-91-076; CONF-910920--19; ON: DE92009945
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
080201* -- Hydrogen-- Chemisorption Storage
36 MATERIALS SCIENCE
360200 -- Ceramics
Cermets
& Refractories
AGING
ALUMINIUM COMPOUNDS
ALUMINIUM HYDRIDES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CRYSTAL STRUCTURE
DESORPTION
HYDRIDES
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
HYDROGEN STORAGE
ISOTOPES
LANTHANUM COMPOUNDS
LANTHANUM HYDRIDES
LIGHT NUCLEI
MICROSTRUCTURE
NICKEL COMPOUNDS
NICKEL HYDRIDES
NUCLEI
ODD-EVEN NUCLEI
PALLADIUM COMPOUNDS
PALLADIUM HYDRIDES
PHYSICAL PROPERTIES
PROCESSING
RADIOISOTOPES
RARE EARTH COMPOUNDS
STORAGE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRITIDES
TRITIUM
TRITIUM COMPOUNDS
YEARS LIVING RADIOISOTOPES