Aging effects in palladium and LaNi{sub 4.25}Al{sub 0.75} tritides

Conference · Tue Dec 31 04:00:00 EST 1991

OSTI ID:10131086

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: USDOE, Washington, DC (United States)
• DOE Contract Number: AC09-89SR18035
• OSTI ID: 10131086
• Report Number(s): WSRC-MS--91-076; CONF-910920--19; ON: DE92009945
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
080201
36 MATERIALS SCIENCE
360200
AGING
ALUMINIUM HYDRIDES
CERAMICS, CERMETS, AND REFRACTORIES
CHEMISORPTION STORAGE
DESORPTION
HYDROGEN STORAGE
LANTHANUM HYDRIDES
MICROSTRUCTURE
NICKEL HYDRIDES
PALLADIUM HYDRIDES
PROCESSING
STORAGE
THERMODYNAMIC PROPERTIES
TRITIDES
TRITIUM