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

Result code in 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>
Result on the web
<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>

Result language
angličtina
Original language name
The magnetic transition in epsilon-Fe2O3 nanoparticles: Magnetic properties and hyperfine interactions from Mossbauer spectroscopy
Original language description
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
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BM - Solid-state physics and magnetism
OECD FORD branch
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Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Publication year
2015
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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