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A new approach to near-surface positron annihilation analysis of ion irradiated ferritic alloys

The present work provides an innovative approach to the near-surface slow-positron-beam (SPB) study of structural materials exposed to ion-beam irradiation. This approach enables the use of variable-energy positron annihilation lifetime spectroscopy (PALS) to characterise a wide range of microstruct...

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Autores principales: Kršjak, Vladimír, Hruška, Petr, Degmová, Jarmila, Sojak, Stanislav, Noga, Pavol, Shen, Tielong, Sabelová, Veronika, Egger, Werner, Slugeň, Vladimír
Formato: Online Artículo Texto
Lenguaje:English
Publicado: RSC 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9417578/
https://www.ncbi.nlm.nih.gov/pubmed/36132661
http://dx.doi.org/10.1039/d1na00394a
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author Kršjak, Vladimír
Hruška, Petr
Degmová, Jarmila
Sojak, Stanislav
Noga, Pavol
Shen, Tielong
Sabelová, Veronika
Egger, Werner
Slugeň, Vladimír
author_facet Kršjak, Vladimír
Hruška, Petr
Degmová, Jarmila
Sojak, Stanislav
Noga, Pavol
Shen, Tielong
Sabelová, Veronika
Egger, Werner
Slugeň, Vladimír
author_sort Kršjak, Vladimír
collection PubMed
description The present work provides an innovative approach to the near-surface slow-positron-beam (SPB) study of structural materials exposed to ion-beam irradiation. This approach enables the use of variable-energy positron annihilation lifetime spectroscopy (PALS) to characterise a wide range of microstructural damage along the ion implantation profile. In a typical application of the SPB PALS technique, positron lifetime is used to provide qualitative information on the size of vacancy clusters as a function of the positron energy, i.e., the probing depth of the spectrometer. This approach is limited to a certain defect concentration above which the positron lifetime gets saturated. In our experiments, we investigated the back-diffusion of positrons and their annihilation at the surface. The probability of such an event is characterised by the positron diffusion length, and it depends on the density of lattice defects, even in the saturation range of the positron lifetime. Until now, the back-diffusion experiments were reported only in connection with Doppler broadening spectroscopy (DBS) of positron-annihilation radiation. To verify the validity of the used approach, we compared the obtained results on helium-implanted Fe9Cr alloy and its oxide dispersion strengthened variant with the transmission electron microscopy and “conventional” slow positron DBS analysis.
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spelling pubmed-94175782022-09-20 A new approach to near-surface positron annihilation analysis of ion irradiated ferritic alloys Kršjak, Vladimír Hruška, Petr Degmová, Jarmila Sojak, Stanislav Noga, Pavol Shen, Tielong Sabelová, Veronika Egger, Werner Slugeň, Vladimír Nanoscale Adv Chemistry The present work provides an innovative approach to the near-surface slow-positron-beam (SPB) study of structural materials exposed to ion-beam irradiation. This approach enables the use of variable-energy positron annihilation lifetime spectroscopy (PALS) to characterise a wide range of microstructural damage along the ion implantation profile. In a typical application of the SPB PALS technique, positron lifetime is used to provide qualitative information on the size of vacancy clusters as a function of the positron energy, i.e., the probing depth of the spectrometer. This approach is limited to a certain defect concentration above which the positron lifetime gets saturated. In our experiments, we investigated the back-diffusion of positrons and their annihilation at the surface. The probability of such an event is characterised by the positron diffusion length, and it depends on the density of lattice defects, even in the saturation range of the positron lifetime. Until now, the back-diffusion experiments were reported only in connection with Doppler broadening spectroscopy (DBS) of positron-annihilation radiation. To verify the validity of the used approach, we compared the obtained results on helium-implanted Fe9Cr alloy and its oxide dispersion strengthened variant with the transmission electron microscopy and “conventional” slow positron DBS analysis. RSC 2021-09-03 /pmc/articles/PMC9417578/ /pubmed/36132661 http://dx.doi.org/10.1039/d1na00394a Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by/3.0/
spellingShingle Chemistry
Kršjak, Vladimír
Hruška, Petr
Degmová, Jarmila
Sojak, Stanislav
Noga, Pavol
Shen, Tielong
Sabelová, Veronika
Egger, Werner
Slugeň, Vladimír
A new approach to near-surface positron annihilation analysis of ion irradiated ferritic alloys
title A new approach to near-surface positron annihilation analysis of ion irradiated ferritic alloys
title_full A new approach to near-surface positron annihilation analysis of ion irradiated ferritic alloys
title_fullStr A new approach to near-surface positron annihilation analysis of ion irradiated ferritic alloys
title_full_unstemmed A new approach to near-surface positron annihilation analysis of ion irradiated ferritic alloys
title_short A new approach to near-surface positron annihilation analysis of ion irradiated ferritic alloys
title_sort new approach to near-surface positron annihilation analysis of ion irradiated ferritic alloys
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9417578/
https://www.ncbi.nlm.nih.gov/pubmed/36132661
http://dx.doi.org/10.1039/d1na00394a
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