Change in Superparamagnetic State Induced by Swift Heavy Ion Irradiation in Nano-Maghemite

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F24%3A73624745" target="_blank" >RIV/61989592:15310/24:73624745 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.mdpi.com/2075-4701/14/4/421" target="_blank" >https://www.mdpi.com/2075-4701/14/4/421</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/met14040421" target="_blank" >10.3390/met14040421</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Change in Superparamagnetic State Induced by Swift Heavy Ion Irradiation in Nano-Maghemite

Popis výsledku v původním jazyce

The effect of swift heavy ion irradiation on sol–gel-prepared maghemite nanoparticles was studied by 57Fe transmission Mössbauer spectroscopy and X-ray diffractometry (XRD). The room temperature Mössbauer spectra of the non-irradiated nano-maghemite showed poorly resolved magnetically split, typical relaxation spectra due to the superparamagnetic state of the nanoparticles. Significant changes in the line shape, indicating changes in the superparamagnetic state, were found in the Mössbauer spectra upon irradiation by 160 MeV and 155 MeV ^132Xe^26+ ions with fluences of 5 × 10^13 ion cm^−2 and 1 × 10^14 ion cm^−2. XRD of the irradiated maghemite nanoparticles showed a significant broadening of the corresponding lines, indicating a decrease in the crystallite size, compared to those of the non-irradiated ones. The results are discussed in terms of the defects induced by irradiation and the corresponding changes related to the change in particle size and consequently in the superparamagnetic state caused by irradiation.

Název v anglickém jazyce

Change in Superparamagnetic State Induced by Swift Heavy Ion Irradiation in Nano-Maghemite

Popis výsledku anglicky

The effect of swift heavy ion irradiation on sol–gel-prepared maghemite nanoparticles was studied by 57Fe transmission Mössbauer spectroscopy and X-ray diffractometry (XRD). The room temperature Mössbauer spectra of the non-irradiated nano-maghemite showed poorly resolved magnetically split, typical relaxation spectra due to the superparamagnetic state of the nanoparticles. Significant changes in the line shape, indicating changes in the superparamagnetic state, were found in the Mössbauer spectra upon irradiation by 160 MeV and 155 MeV ^132Xe^26+ ions with fluences of 5 × 10^13 ion cm^−2 and 1 × 10^14 ion cm^−2. XRD of the irradiated maghemite nanoparticles showed a significant broadening of the corresponding lines, indicating a decrease in the crystallite size, compared to those of the non-irradiated ones. The results are discussed in terms of the defects induced by irradiation and the corresponding changes related to the change in particle size and consequently in the superparamagnetic state caused by irradiation.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

21001 - Nano-materials (production and properties)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

Metals

ISSN

2075-4701

e-ISSN

—

Svazek periodika

14

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

13

Strana od-do

"421-1"-"421-13"

Kód UT WoS článku

001210483900001

EID výsledku v databázi Scopus

2-s2.0-85191457361