Identification of ferric oxide polymorphs in nanoparticles prepared by sol-gel method and maximization of epsilon-Fe2O3 content

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F19%3A10388239" target="_blank" >RIV/00216208:11320/19:10388239 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=FdoIiIeW2o" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=FdoIiIeW2o</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.jmmm.2018.09.107" target="_blank" >10.1016/j.jmmm.2018.09.107</a>

Result language
angličtina
Original language name
Identification of ferric oxide polymorphs in nanoparticles prepared by sol-gel method and maximization of epsilon-Fe2O3 content
Original language description
The effects of annealing temperature (1000-1125 degrees C) and Fe2O3 mass fraction (0.3-0.5) in the initial mixture on the composition of ferric oxide polymorphs within the Fe2O3/SiO2 nanocomposite prepared by sol-gel method were investigated. The structural and magnetic properties of prepared samples were characterized in detail by combination of X-ray powder diffraction (XRPD), high-resolution transmission electron microscopy, magnetic measurements and a local probe technique - transmission Mossbauer spectroscopy (TMS). The optimal conditions for preparation of epsilon-Fe2O3 rich sample were established and similar to 91% of the epsilon-phase was reached with the characteristic particle diameter of 25 nm. It was observed that with increasing mass fraction of Fe2O3 in the starting material, the optimal annealing temperature decreases, while the width of the particle size distribution tends to increase. The relative concentrations of the four present polymorphs derived from XRD and TMS are in very good mutual agreement.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project
<a href="/en/project/GA16-04340S" target="_blank" >GA16-04340S: Oxide nanomagnets, their properties and interactions with biological systems</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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