Formation and migration energies of monovacancies in tantalum

Journal Article · Mon Aug 22 04:00:00 EDT 1977 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.39.484· OSTI ID:7099068

Maier, K; Metz, H; Herlach, D; Schaefer, H E; Seeger, A

Vacancies in thermal equilibrium were investigated by measuring the Doppler broadening of the 2..gamma.. positron-annihilation line of Ta from 35 K to the melting temperature. Experimental evidence for detrapping of positrons from vacancies at high temperatures was found. The consequences of the values obtained for monovacancy-formation and -migration enthalpies, H/sub IV//sup F/ approx. = 2.2 eV, H/sub IV//sup M/ = approx. = 1.9 eV, for the interpretation of radiation damage and cold-work experiments are discussed.

• Research Organization: Universitaet Stuttgart, Institut fuer Theoretische und Angewandte Physik, Stuttgart, Germany
• OSTI ID: 7099068
• Journal Information: Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 39:8; ISSN PRLTA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
COLD WORKING
COLLISIONS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DOPPLER BROADENING
ELECTRON COLLISIONS
ELECTRON-POSITRON COLLISIONS
ELEMENTS
ENERGY
FABRICATION
FORMATION FREE ENTHALPY
FREE ENTHALPY
INTERSTITIALS
LINE BROADENING
MATERIALS WORKING
METALS
MIGRATION LENGTH
PHYSICAL PROPERTIES
PHYSICAL RADIATION EFFECTS
POINT DEFECTS
POSITRON COLLISIONS
RADIATION EFFECTS
RECOMBINATION
REFRACTORY METALS
TANTALUM
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS
TRAPPING
ULTRAHIGH VACUUM
VACANCIES