Characterization of lattice distortions in refractory metal complex concentrated alloys using positron annihilation spectroscopy

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F22%3A10456296" target="_blank" >RIV/00216208:11320/22:10456296 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=U5UzYcyXEG" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=U5UzYcyXEG</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.mtla.2022.101450" target="_blank" >10.1016/j.mtla.2022.101450</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Characterization of lattice distortions in refractory metal complex concentrated alloys using positron annihilation spectroscopy

Popis výsledku v původním jazyce

Severe distortions of crystalline lattice represent an inherent feature of complex concentrated alloys (CCAs). Lattice distortions are caused by atomic size differences of alloy constituent ions which are distributed randomly over the lattice sites. It is believed that lattice distortions play the key role in extraordinary properties of CCAs. However, characterization of lattice distortions is difficult since they occur on the atomic scale and have a stochastic nature. In the present work we employ positron annihilation spectroscopy for characterization of lattice distortions in series of 18 refractory metal CCAs with the bcc structure. Our study revealed that the bulk positron lifetime increases with increasing magnitude of lattice distortions. It indicates that positron delocalized in the lattice can be used as a probe of lattice distortions in CCAs since it is located with higher probability in interstitial regions with extended open volume. This experimental observation is supported by theoretical calculations of positron lifetimes in CCAs. Moreover, it was confirmed that lattice distortions cause strengthening of CCAs.

Název v anglickém jazyce

Characterization of lattice distortions in refractory metal complex concentrated alloys using positron annihilation spectroscopy

Popis výsledku anglicky

Severe distortions of crystalline lattice represent an inherent feature of complex concentrated alloys (CCAs). Lattice distortions are caused by atomic size differences of alloy constituent ions which are distributed randomly over the lattice sites. It is believed that lattice distortions play the key role in extraordinary properties of CCAs. However, characterization of lattice distortions is difficult since they occur on the atomic scale and have a stochastic nature. In the present work we employ positron annihilation spectroscopy for characterization of lattice distortions in series of 18 refractory metal CCAs with the bcc structure. Our study revealed that the bulk positron lifetime increases with increasing magnitude of lattice distortions. It indicates that positron delocalized in the lattice can be used as a probe of lattice distortions in CCAs since it is located with higher probability in interstitial regions with extended open volume. This experimental observation is supported by theoretical calculations of positron lifetimes in CCAs. Moreover, it was confirmed that lattice distortions cause strengthening of CCAs.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

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

Projekt

<a href="/cs/project/GA21-16218S" target="_blank" >GA21-16218S: Absorpce a desorpce vodíku ve slitinách přechodových kovů s vysokou entropií s kubickou prostorově centrovanou strukturou</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Materialia [online]

ISSN

2589-1529

e-ISSN

—

Svazek periodika

23

Číslo periodika v rámci svazku

June

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

9

Strana od-do

101450

Kód UT WoS článku

000804533700005

EID výsledku v databázi Scopus

2-s2.0-85130079558