Nanocrystalline Iron(III) Oxides Formed under Dynamic Heathing of Ferrous Oxalate Dihydrate in Air

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F05%3A00001901" target="_blank" >RIV/61989592:15310/05:00001901 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Nanocrystalline Iron(III) Oxides Formed under Dynamic Heathing of Ferrous Oxalate Dihydrate in Air

Popis výsledku v původním jazyce

A dynamic study of the thermal decomposition of FeC2O42H2O has been carried out in air in the range of 25-500 °C with a heating rate of 5 oC/min using the conventional methods of thermal analysis including TG and DSC. The phase composition at different calcination temperatures was determined from 57Fe Mössbauer spectra. It was found that the primary dehydration and liberation of carbon oxides from the oxalate structure is followed by a direct oxidation of Fe(II) to nanocrystalline Fe2O3 with a large surface area of about 250 m2/g. Such nanopowder is comprised of nanocrystalline particles of - and -Fe2O3 as proved by XRD, low temperature Mössbauer spectroscopy and HRTEM analysis. In contradiction with the literature assumption, no traces of magnetite (Fe3O4) have been identified during the oxidative decomposition in air. The simultaneous formation of both - and -Fe2O3 polymorphs at low temperatures is followed by an isochemical structural change of maghemite to hematite. The comparison

Název v anglickém jazyce

Nanocrystalline Iron(III) Oxides Formed under Dynamic Heathing of Ferrous Oxalate Dihydrate in Air

Popis výsledku anglicky

A dynamic study of the thermal decomposition of FeC2O42H2O has been carried out in air in the range of 25-500 °C with a heating rate of 5 oC/min using the conventional methods of thermal analysis including TG and DSC. The phase composition at different calcination temperatures was determined from 57Fe Mössbauer spectra. It was found that the primary dehydration and liberation of carbon oxides from the oxalate structure is followed by a direct oxidation of Fe(II) to nanocrystalline Fe2O3 with a large surface area of about 250 m2/g. Such nanopowder is comprised of nanocrystalline particles of - and -Fe2O3 as proved by XRD, low temperature Mössbauer spectroscopy and HRTEM analysis. In contradiction with the literature assumption, no traces of magnetite (Fe3O4) have been identified during the oxidative decomposition in air. The simultaneous formation of both - and -Fe2O3 polymorphs at low temperatures is followed by an isochemical structural change of maghemite to hematite. The comparison

Druh

D - Stať ve sborníku

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

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Projekt

<a href="/cs/project/GP202%2F03%2FP099" target="_blank" >GP202/03/P099: Vliv velikosti částic solí železa na mechanismus jejich transformace na oxid železitý</a><br>

Návaznosti

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

Rok uplatnění

2005

Kód důvěrnosti údajů

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

Název statě ve sborníku

Industrial Applications of the Mössbauer Effect

ISBN

0-7354-0250-7

ISSN

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e-ISSN

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Počet stran výsledku

403

Strana od-do

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Název nakladatele

American Institute of Physics

Místo vydání

New York

Místo konání akce

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Datum konání akce

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Typ akce podle státní příslušnosti

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Kód UT WoS článku

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