Kinetics of spontaneous phase transitions from wüstite to magnetite in superparamagnetic core-shell nanocubes of iron oxides

Sojková, Tereza; Gröger, Roman; Poloprudský, Jakub; Kuběna, Ivo; Schneeweiss, Oldřich; Sojka, Martin; Šiška, Zuzana; Pongrácz, Jakub; Pizúrová, Naděžda

doi:https://dx.doi.org/10.1039/d3nr06254f

Počet záznamů: 1

Kinetics of spontaneous phase transitions from wüstite to magnetite in superparamagnetic core-shell nanocubes of iron oxides

1.

SYSNO ASEP	0584255
Druh ASEP	J - Článek v odborném periodiku
Zařazení RIV	J - Článek v odborném periodiku
Poddruh J	Článek ve WOS
Název	Kinetics of spontaneous phase transitions from wüstite to magnetite in superparamagnetic core-shell nanocubes of iron oxides
Tvůrce(i)	Sojková, Tereza (UFM-A)_{ORCID, RID} Gröger, Roman (UFM-A)_{RID, ORCID} Poloprudský, Jakub (UFM-A)_ORCID Kuběna, Ivo (UFM-A)_{RID, ORCID} Schneeweiss, Oldřich (UFM-A)_{RID, ORCID} Sojka, Martin (UFM-A)_{RID, ORCID} Šiška, Zuzana (UFM-A) Pongrácz, Jakub (UFM-A)_ORCID Pizúrová, Naděžda (UFM-A)_{RID, ORCID}
Celkový počet autorů	9
Zdroj.dok.	Nanoscale. - : Royal Society of Chemistry - ISSN 2040-3364 Roč. 16, č. 11 (2024), s. 5551-5560
Poč.str.	10 s.
Jazyk dok.	eng - angličtina
Země vyd.	GB - Velká Británie
Klíč. slova	wustite nanoparticles ; exchange bias ; transformation ; oxidation ; oxygen
Vědní obor RIV	CA - Anorganická chemie
Obor OECD	Inorganic and nuclear chemistry
Výzkumná infrastruktura	CzechNanoLab - 90110 - Vysoké učení technické v Brně
Způsob publikování	Omezený přístup
Institucionální podpora	UFM-A - RVO:68081723
UT WOS	001169274700001
EID SCOPUS	85186099509
DOI	10.1039/d3nr06254f
Anotace	Iron oxide nanoparticles with a wustite structure have been prepared by thermal decomposition. In air, they undergo a spontaneous transition into a thermodynamically more stable magnetite structure that grows from the surface. The thickness of this magnetite shell increases with time, thereby producing a series of core-shell nanoparticles. We investigated the kinetics of this phase transition in 23 nm nanocubes using time-resolved XRD, from which the fractions of individual phases were determined by the Rietveld refinement. This kinetics is described theoretically using three coupled reaction-diffusion master equations for the concentrations of oxygen, wustite, and magnetite, in which both the diffusion of oxygen and its reaction with wustite are thermally activated. The coefficients of these terms were adjusted so that the predictions of the model reproduce the XRD data at 298 K and 353 K, whereas the predictive capability of the model was assessed by comparing its predictions with measurements at 403 K.
Pracoviště	Ústav fyziky materiálu
Kontakt	Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485
Rok sběru	2025
Elektronická adresa	https://pubs.rsc.org/en/content/articlelanding/2024/nr/d3nr06254f

Počet záznamů: 1