Abstract
The temperature dependence of positron annihilation in aluminum has been investigated over the range 20-435\ifmmode^\circ\else\textdegree\fi{}C by simultaneous measurements of positron lifetime and Doppler broadening of the annihilation spectrum. The analyses of lifetime data are critically examined, especially with respect to the effects of instrumental resolution-function uncertainties. The lifetime and Doppler-broadening data have been analyzed in terms of the two-state trapping model. Application of this model to the measurement of the vacancy-formation enthalpy ${E}_{\mathrm{v}}^{F}$ in aluminum is discussed in light of the observation of a strong temperature dependence of the apparent positron lifetime in the bulk or lattice state above 370\ifmmode^\circ\else\textdegree\fi{}C. The monovacancy formation enthalpy in aluminum, ${E}_{1\mathrm{v}}^{F}=0.66\ifmmode\pm\else\textpm\fi{}0.02$ eV, was determined for temperatures below 372\ifmmode^\circ\else\textdegree\fi{}C. This is compared with values previously reported.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
