Mechanism of isochemical transformations of iron(III) oxide nanoparticles - Mössbauer study

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F01%3A00001391" target="_blank" >RIV/61989592:15310/01:00001391 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61989100:27350/01:00001239

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Mechanism of isochemical transformations of iron(III) oxide nanoparticles - Mössbauer study

Popis výsledku v původním jazyce

The differences in the mechanism of the thermal transformation of cubic (b-Fe2O3, g-Fe2O3) nanoparticles are discussed and demonstrated with several experimental examples. Ultrafine particles of b-Fe2O3 were prepared by solid-state reaction of NaCl withFe2(SO4)3 in air, and by the thermal decomposition of Fe2(SO4)3. g-Fe2O3 nanoparticles were obtained by thermally-induced oxidation of FeSO4 and almandine garnet. Samples of nanocrystalline Fe2O3 particles were thermally treated in air at different temperatures and the changes of their structure, size and morphology were investigated using Mössbauer spectroscopy and atomic force microscopy (AFM). Mössbauer spectra proved the formation of e-Fe2O3 as intermediate during thermally induced transformation ofg-Fe2O3 nanoparticles to a-Fe2O3 while the direct transformation way was observed in the case of b-Fe2O3. All isochemical structural transformations were induced by the particle size increase, in accordance with AFM observations.

Název v anglickém jazyce

Mechanism of isochemical transformations of iron(III) oxide nanoparticles - Mössbauer study

Popis výsledku anglicky

The differences in the mechanism of the thermal transformation of cubic (b-Fe2O3, g-Fe2O3) nanoparticles are discussed and demonstrated with several experimental examples. Ultrafine particles of b-Fe2O3 were prepared by solid-state reaction of NaCl withFe2(SO4)3 in air, and by the thermal decomposition of Fe2(SO4)3. g-Fe2O3 nanoparticles were obtained by thermally-induced oxidation of FeSO4 and almandine garnet. Samples of nanocrystalline Fe2O3 particles were thermally treated in air at different temperatures and the changes of their structure, size and morphology were investigated using Mössbauer spectroscopy and atomic force microscopy (AFM). Mössbauer spectra proved the formation of e-Fe2O3 as intermediate during thermally induced transformation ofg-Fe2O3 nanoparticles to a-Fe2O3 while the direct transformation way was observed in the case of b-Fe2O3. All isochemical structural transformations were induced by the particle size increase, in accordance with AFM observations.

Druh

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

CEP obor

CF - Fyzikální chemie a teoretická chemie

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2001

Kód důvěrnosti údajů

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

Název periodika

Journal of Nuclear and Radiochemical Sciences

ISSN

1345-2762

e-ISSN

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Svazek periodika

2

Číslo periodika v rámci svazku

N

Stát vydavatele periodika

JP - Japonsko

Počet stran výsledku

2

Strana od-do

136-137

Kód UT WoS článku

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EID výsledku v databázi Scopus

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