http://www.cnr.it/ontology/cnr/individuo/prodotto/ID273022

Oxygen transport in nanostructured lanthanum manganites (Articolo in rivista)

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Label

Oxygen transport in nanostructured lanthanum manganites (Articolo in rivista) (literal)

Anno

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Alternative label

Ilenia Rossetti, Mattia Allieta, Cesare Biffi and Marco Scavini (2013)
Oxygen transport in nanostructured lanthanum manganites
in PCCP. Physical chemistry chemical physics (Print); ROYAL SOC CHEMISTRY, THOMAS GRAHAM HOUSE,, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND (Regno Unito)
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Articolo di personale esterno afferente al modulo PM.P03.005.002 - Nuovi materiali per produzione e 'storage' di idrogeno. (literal)

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Note

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Dip. Chimica, Università degli Studi di Milano, CNR-ISTM center and INSTM Milano-Università Unit v. C. Golgi 19, I-20133 Milano, Italy. (literal)

Titolo

Abstract

Methods and models describing oxygen diffusion and desorption in oxides have been developed for slightly defective and well crystallised bulky materials. Does nanostructuring change the mechanism of oxygen mobility? In such a case, models should be properly checked and adapted to take into account new material properties. In order to do so, temperature programmed oxygen desorption and thermogravimetric analysis, either in isothermal or ramp mode, have been used to investigate some nanostructured La(1-x)A(x)MnO(3-delta) samples (A = Sr and Ce, 20-60 nm particle size) with perovskite-like structure. The experimental data have been elaborated by means of different models to define a set of kinetic parameters able to describe oxygen release properties and oxygen diffusion through the bulk. Different rate-determining steps have been identified, depending on the temperature range and oxygen depletion of the material. In particular, oxygen diffusion was shown to be rate-limiting at low temperature and at low defect concentration, whereas oxygen recombination at the surface seems to be the rate-controlling step at high temperature. However, the oxygen recombination step is characterised by an activation energy much lower than that for diffusion. In the present paper oxygen transport in nanosized materials is quantified by making use of widely diffused experimental techniques and by critically adapting to nanoparticles suitably chosen models developed for bulk materials (literal)

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