Activation volume and chemical environment of atomic vacancies in intermetallic compounds

M. A. Müller, W. Sprengel, J. Major, H. E. Schaefer

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Positron annihilation spectroscopy was used to investigate the temperature, time and pressure dependence of the equilibration of the thermal vacancy concentration in B2-Fe61Al39 after fast temperature changes at elevated temperatures. A two stage equilibration process was observed with a migration enthalpy of H1 V M = (0.8 ± 0.2) eV and H2 V M = (1.7 ± 0.3) eV for a faster, initial process and a long-term, main process, respectively. For the main process a formation volume of VV F = (1.5 ± 0.3) Ω and a migration volume of VV F = (4.6 ± 1.1) Ω for thermal vacancies were determined. By employing coincident Doppler broadening studies it could be demonstrated for the first time for the model case of FeAl that thermal vacancies are formed on the transition metal sublattice.

Original languageEnglish
Pages (from-to)85-87
Number of pages3
JournalMaterials Science Forum
Volume363-365
Publication statusPublished - 2001

Fingerprint

Vacancies
Intermetallics
intermetallics
Chemical activation
activation
Positron annihilation spectroscopy
Doppler effect
positron annihilation
Temperature
pressure dependence
sublattices
time dependence
Transition metals
Enthalpy
enthalpy
transition metals
temperature dependence
temperature
spectroscopy
Hot Temperature

Keywords

  • Coincident Doppler broadening
  • Fe vacancies
  • Intermetallic compounds
  • Migration volume

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Activation volume and chemical environment of atomic vacancies in intermetallic compounds. / Müller, M. A.; Sprengel, W.; Major, J.; Schaefer, H. E.

In: Materials Science Forum, Vol. 363-365, 2001, p. 85-87.

Research output: Contribution to journalArticle

Müller, M. A. ; Sprengel, W. ; Major, J. ; Schaefer, H. E. / Activation volume and chemical environment of atomic vacancies in intermetallic compounds. In: Materials Science Forum. 2001 ; Vol. 363-365. pp. 85-87.
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