MIGRATION ENTHALPY OF THERMAL VACANCIES BY POSITRON SPECTROSCOPY

Emad A. Badawi ()
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Emad A. Badawi: Faculty of Science, Physics Department, El-Minia University, El-Minia, Egypt

Surface Review and Letters (SRL), 2005, vol. 12, issue 04, 493-498

Abstract: The trapping of positrons at vacancy site in some materials provide a new and sensitive method for the equilibrium determination of point defect migration enthalpy. Data are presented for commercialAl–Mgalloys and fitted to a model allowing presentation in the form of Arrhenius plots, hence the migration enthalpy$H_{iv}^m$can be determined by positron annihilation lifetime technique (PALT). The results show that as the concentration ofMgincreases the value of$H_{iv}^m$increases too.

Keywords: Lifetime; migration enthalpy; thermal vacancies; Al–Mgalloys (search for similar items in EconPapers)
Date: 2005
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DOI: 10.1142/S0218625X05007323

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