Abstract
Positron annihilation Doppler-broadening and lifetime data obtained for Cu in the temperature region of about 25-1040 degrees C are presented. The data were obtained by utilising a new 22Na ion-implanted source-fabrication technique. The Doppler-broadening data were analysed using both a monovacancy and a monovacancy-divacancy two-state trapping model. For the monovacancy model a vacancy formation enthalpy of H1vF=1.31+or-0.05 eV was deduced. A quantitative method for diagnosing the relative effect of each data point on the determination of H1vF was introduced. The suitability of including divacancies in the analysis is also considered. The conclusion reached is that the measured formation enthalpy is indeed that for monovacancies.
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