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Positron Annihilation in Corroded Steels St20 and St3S

100%

Pietrzak R., Smiatek W., Szatanik R.

Acta Physica Polonica A

2006

vol. 110

issue 5

667-676

The paper deals with examining the lifetimes of positrons emitted from ^{22}Na source in corroded St20 and St3S steels. Influence of the method of defecting the sample surfaces on the spectrum of positron lifetimes was investigated. Influence of temperature of initial annealing of samples, plastic deformation, electrolytic hydrogenation and corrosion in HCl vapors on trapping positrons in the examined steels was also determined.

Investigations into the Influence of Hydrogen and Defects on the Spectra of Lifetime of Positrons in Palladium

100%

Pietrzak R., Szatanik R., Smiatek W.

Acta Physica Polonica A

2001

vol. 99

issue 3-4

455-463

The influence of interstitial hydrogen concentration and structural defects caused by quenching of palladium, begun at different temperatures up to the temperature of liquid nitrogen or by stretching by external forces, on spectra of lifetimes of positrons in this metal was investigated. It was found that the spectra of positron lifetimes in the examined systems are best described by their distribution into two components. On the basis of the two-state model of annihilation, the conclusion was drawn that the initial temperature from which quenching of palladium is commenced and also the relative elongation, which is caused by external forces, markedly influence the concentrations and sizes of defects in the sample.

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2 Acta Physica Polonica A

1 2006

1 2001

2 Pietrzak R.

2 Smiatek W.

2 Szatanik R.

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Positron Annihilation in Corroded Steels St20 and St3S

Investigations into the Influence of Hydrogen and Defects on the Spectra of Lifetime of Positrons in Palladium