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- W2072108889 abstract "Corrosion-related defects of pure iron were investigated by measuring Doppler broadening energy spectra (DBES) of positron annihilation and positron annihilation lifetime (PAL). Defect profiles of the S -parameter from DBES as a function of positron incident energy up to 30 keV (i.e. ∼1 μm depth) were analyzed. The DBES data show that S -parameter increases as a function of positron incident energy (mean depth) after corrosion, and the increase in the S -parameter is larger near the surface than in the bulk due to corrosion. Furthermore, information on defect size from PAL data as a function of positron incident energy up to 10 keV (i.e. ∼0.2 μm depth) was analyzed. In the two-state trapping model, the lifetime τ 2 = 500 ps is ascribed to annihilation of positrons in voids with a size of the order of nanometer. τ 1 , which decreases with depth from the surface to the bulk, is ascribed to the annihilation of positrons in dislocations and three-dimensional vacancy clusters. The corroded samples show a significant increase in τ 1 and the intensity I 2 , and near the surface the corroded iron introduces both voids and large-size three-dimensional vacancy clusters. The size of vacancy clusters decreases with depth." @default.
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- W2072108889 date "2006-02-01" @default.
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- W2072108889 title "Slow positron beam study of corrosion-related defects in pure iron" @default.
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- W2072108889 doi "https://doi.org/10.1016/j.apsusc.2005.08.050" @default.
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