Recovery of T/sub c/ by annealing of irradiated A-15 compounds

Conference · Sat Jan 01 04:00:00 EST 1977

OSTI ID:7286002

Dew-Hughes, D; Moehlecke, S; Welch, D O

A model has been developed for the recovery of T/sub c/ in radiation-damaged A-15 compounds. This model has been applied to isothermal annealing data at 550/sup 0/C on a sample of Nb/sub 3/Ge, and to isochronal annealing (200/sup 0/C to 900/sup 0/C) data on V/sub 3/Si, Nb/sub 3/Ge and Nb/sub 3/Sn subjected to varying doses of fast neutrons, and on Nb/sub 3/Al of various compositions subjected to the same dose. The recovery is assumed to take place by vacancy-assisted reordering and occurs in several stages. The major low-temperature stage involves a fairly stable population of irradiation-induced vacancies. At high temperatures these are replaced by thermal vacancies. Activation energies calculated for these processes, approximately 0.6 to 1.3 eV for site interchange, and approximately 1 to 2 eV for vacancy formation, are consistent with what is known about diffusion in the A-15 structure. Activation energies show some dependence upon radiation dose, but little upon composition.

• Research Organization: Brookhaven National Lab., Upton, N.Y. (USA)
• DOE Contract Number: EY-76-C-02-0016
• OSTI ID: 7286002
• Report Number(s): BNL-22925; CONF-770649-3
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360106* -- Metals & Alloys-- Radiation Effects
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
ALUMINIUM ALLOYS
ANNEALING
CRITICAL TEMPERATURE
GERMANIUM ALLOYS
HEAT TREATMENTS
HIGH TEMPERATURE
NIOBIUM ALLOYS
PHYSICAL PROPERTIES
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
SILICON ALLOYS
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TIN ALLOYS
TRANSITION TEMPERATURE
VANADIUM ALLOYS
VERY HIGH TEMPERATURE