The magnetic transition in epsilon-Fe2O3 nanoparticles: Magnetic properties and hyperfine interactions from Mossbauer spectroscopy

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F15%3A10321684" target="_blank" >RIV/00216208:11320/15:10321684 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1063/1.4907610" target="_blank" >http://dx.doi.org/10.1063/1.4907610</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/1.4907610" target="_blank" >10.1063/1.4907610</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The magnetic transition in epsilon-Fe2O3 nanoparticles: Magnetic properties and hyperfine interactions from Mossbauer spectroscopy

Popis výsledku v původním jazyce

The nanoparticles of epsilon-Fe2O3 enriched with 57 Fe isotope in amorphous silica matrix were prepared by sol-gel technique starting from a single molecular precursor for both Fe2O3 and silica. From the X-ray powder diffraction pattern epsilon-Fe2O3 wasidentified as the major phase and alpha-Fe2O3 and beta-Fe2O3 were observed as minor iron oxide phases. Using the log-normal distribution for fitting the experimental data from the TEM micrographs, the characteristic size of particles d(0) similar to 25nm was derived. The rather high coercivity of similar to 2.1 T at room temperature was confirmed for our nanoparticle system. From the dependences of magnetization on temperature a two-step magnetic transition spread between 100 K and 153 K was indicated. From the 57 Fe Mossbauer spectra measured in the temperature range of 4.2-300 K, the hyperfine parameters for one tetrahedral and three octahedral sites of epsilon-Fe2O3 structure were identified. The in-field spectra in the external ma

Název v anglickém jazyce

The magnetic transition in epsilon-Fe2O3 nanoparticles: Magnetic properties and hyperfine interactions from Mossbauer spectroscopy

Popis výsledku anglicky

The nanoparticles of epsilon-Fe2O3 enriched with 57 Fe isotope in amorphous silica matrix were prepared by sol-gel technique starting from a single molecular precursor for both Fe2O3 and silica. From the X-ray powder diffraction pattern epsilon-Fe2O3 wasidentified as the major phase and alpha-Fe2O3 and beta-Fe2O3 were observed as minor iron oxide phases. Using the log-normal distribution for fitting the experimental data from the TEM micrographs, the characteristic size of particles d(0) similar to 25nm was derived. The rather high coercivity of similar to 2.1 T at room temperature was confirmed for our nanoparticle system. From the dependences of magnetization on temperature a two-step magnetic transition spread between 100 K and 153 K was indicated. From the 57 Fe Mossbauer spectra measured in the temperature range of 4.2-300 K, the hyperfine parameters for one tetrahedral and three octahedral sites of epsilon-Fe2O3 structure were identified. The in-field spectra in the external ma

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

—

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

2015

Kód důvěrnosti údajů

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

Název periodika

Journal of Applied Physics

ISSN

0021-8979

e-ISSN

—

Svazek periodika

117

Číslo periodika v rámci svazku

17

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

4

Strana od-do

1-4

Kód UT WoS článku

000354984100386

EID výsledku v databázi Scopus

2-s2.0-84923675218