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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F21%3A10440287" target="_blank" >RIV/00216208:11320/21:10440287 - isvavai.cz</a>

Result on the web

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=ZfmPWnF4lA" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=ZfmPWnF4lA</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/d1na00394a" target="_blank" >10.1039/d1na00394a</a>

Result language

angličtina

Original language name

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

Original language 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 &quot;conventional&quot; slow positron DBS analysis.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Nanoscale Advances [online]

ISSN

2516-0230

e-ISSN

—

Volume of the periodical

3

Issue of the periodical within the volume

23

Country of publishing house

GB - UNITED KINGDOM

Number of pages

12

Pages from-to

6596-6607

UT code for WoS article

000697470200001

EID of the result in the Scopus database

2-s2.0-85117816795