Oxygen Ion Migration in Perovskite-Type Oxides

Cherry, M. L.; Islam, M. Saïful; Catlow, C. Richard A.

doi:10.1006/jssc.1995.1320

Cited by 421 publications

(295 citation statements)

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“…As expected, diffusion in P-SCO occurs via V O -mediated hopping and involves a relatively large (a 0 /O2) displacement of a single O 2 À (Supplementary Movie 2). The calculated migration energy barrier for this process is 0.5 eV, and similar values were calculated for other oxygen-deficient perovskites 23 .…”

Section: Discussionsupporting

confidence: 81%

Reversible nano-structuring of SrCrO3-δ through oxidation and reduction at low temperature

et al. 2014

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Oxygen vacancies are often present in complex oxides as point defects, and their effect on the electronic properties is typically uniform and isotropic. Exploiting oxygen deficiency in order to generate controllably novel structures and functional properties remains a challenging goal. Here we show that epitaxial strontium chromite films can be transformed, reversibly and at low temperature, from rhombohedral, semiconducting SrCrO 2.8 to cubic, metallic perovskite SrCrO 3-d . Oxygen vacancies in SrCrO 2.8 aggregate and give rise to ordered arrays of {111}-oriented SrO 2 planes interleaved between layers of tetrahedrally coordinated Cr 4 þ and separated by B1 nm. First-principle calculations provide insight into the origin of the stability of such nanostructures and, consistent with the experimental data, predict that the barrier for O 2 À diffusion along these quasi-two-dimensional nanostructures is significantly lower than that in cubic SrCrO 3-d . This property is of considerable relevance to solid oxide fuel cells in which fast O 2 À diffusion reduces the required operating temperature.

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Section: Discussionsupporting

confidence: 81%

Reversible nano-structuring of SrCrO3-δ through oxidation and reduction at low temperature

et al. 2014

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“…The activation energy for the tracer diffusion coefficient is in excellent agreement with the activation energy for the self diffusion coefficient determined from computer simulations on LaCoO,_, by Cherry et al [23].…”

Section: Temperature (%Isupporting

confidence: 86%

Surface oxygen exchange of LaSrCoO

et al. 1997

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The surface oxygen exchange of Lao.3Sro,, Co0,_6 has been studied by 'SO/'hO exchange followed by dynamic SIMS analysis in the temperature region 700-900°C at a po, of 2.1 X lo4 Pa. The activation energy for the surface exchange rate (k) is 283 kJ mol -' and for the oxygen tracer diffusion coefficient (D *) 56t4 kJ mol-' The absolute values for both k and D * are among the highest known in the literature. The characteristic thickness at a po, of 2.1 X lo4 Pa is calculated to lie in the range 0.70 to 1.3 mm and is a function of temperature. The latter reflects the different activation energies for k and D*. The surface oxygen exchange coefficient is proportional to p& with n =0.41 to.02 at WYC, which has been explained by a rate determining step involving an adsorbed oxygen species and an oxygen vacancy. No oxygen pressure dependence for the tracer diffusion coefficient was observed at this temperature.

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“…However, the absolute value of the activation energy calculated by the two techniques is markedly different. The activation energies estimated from isothermal TG analysis are compatible with oxygen migration from BO 6 octahedra in adjacent vacancies in the perovskite lattice (~ 83 kJ / mol [46], or ~ 70 kJ /mol [47] for LaMnO 3±δ ), but they seem largely underestimated when compared with other literature data for bulk materials (see Fig. 11).…”

Section: Comparison With Literature Datasupporting

confidence: 66%

Oxygen transport in nanostructured lanthanum manganites

Rossetti

Allieta

Biffi

et al. 2013

Phys. Chem. Chem. Phys.

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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±δ 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 shows rate-limiting at low temperature and with low defect concentration, whereas oxygen recombination at the surface seems to be the rate-controlling step at high * Corresponding author: Fax: +39-02-50314300; e-mail: ilenia.rossetti@unimi.it 2 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.

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Oxygen Ion Migration in Perovskite-Type Oxides

Cited by 421 publications

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Reversible nano-structuring of SrCrO3-δ through oxidation and reduction at low temperature

Reversible nano-structuring of SrCrO3-δ through oxidation and reduction at low temperature

Surface oxygen exchange of LaSrCoO

Oxygen transport in nanostructured lanthanum manganites

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