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

Result code in 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>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Nanocrystalline Iron(III) Oxides Formed under Dynamic Heathing of Ferrous Oxalate Dihydrate in Air
Original language description
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
Czech name
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Czech description
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Project
<a href="/en/project/GP202%2F03%2FP099" target="_blank" >GP202/03/P099: The influence of particle size of iron-bearing compositions on the mechanism of their transformation to iron oxide</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2005
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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