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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

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/GA16-04340S" target="_blank" >GA16-04340S: Oxidové nanomagnety, jejich vlastnosti a interakce s biologickými systémy</a><br>

Návaznosti

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

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Journal of Magnetism and Magnetic Materials

ISSN

0304-8853

e-ISSN

—

Svazek periodika

472

Číslo periodika v rámci svazku

October 2018

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

8

Strana od-do

96-103

Kód UT WoS článku

000449681300015

EID výsledku v databázi Scopus

2-s2.0-85054663198