| People | Locations | Statistics |
|---|---|---|
| Naji, M. |
| |
| Motta, Antonella |
| |
| Aletan, Dirar |
| |
| Mohamed, Tarek |
| |
| Ertürk, Emre |
| |
| Taccardi, Nicola |
| |
| Kononenko, Denys |
| |
| Petrov, R. H. | Madrid |
|
| Alshaaer, Mazen | Brussels |
|
| Bih, L. |
| |
| Casati, R. |
| |
| Muller, Hermance |
| |
| Kočí, Jan | Prague |
|
| Šuljagić, Marija |
| |
| Kalteremidou, Kalliopi-Artemi | Brussels |
|
| Azam, Siraj |
| |
| Ospanova, Alyiya |
| |
| Blanpain, Bart |
| |
| Ali, M. A. |
| |
| Popa, V. |
| |
| Rančić, M. |
| |
| Ollier, Nadège |
| |
| Azevedo, Nuno Monteiro |
| |
| Landes, Michael |
| |
| Rignanese, Gian-Marco |
|
Cascos, V.
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (2/2 displayed)
- 2022BaFe<sub>0.875</sub>Re<sub>0.125</sub>O<sub>3−<i>δ</i> </sub> and BaFe<sub>0.75</sub>Ta<sub>0.25</sub>O<sub>3−<i>δ</i> </sub> as potential cathodes for solid-oxide fuel-cells: a structural study from neutron diffraction data
- 2017Design of Sr0.7R0.3CoO3-δ(R = Tb and Er) Perovskites Performing as Cathode Materials in Solid Oxide Fuel Cellscitations
Places of action
| Organizations | Location | People |
|---|
article
BaFe<sub>0.875</sub>Re<sub>0.125</sub>O<sub>3−<i>δ</i> </sub> and BaFe<sub>0.75</sub>Ta<sub>0.25</sub>O<sub>3−<i>δ</i> </sub> as potential cathodes for solid-oxide fuel-cells: a structural study from neutron diffraction data
Abstract
<jats:title>Abstract</jats:title><jats:p>In this work, two new perovskites of composition BaFe<jats:sub>0.875</jats:sub>Re<jats:sub>0.125</jats:sub>O<jats:sub>3−<jats:italic>δ</jats:italic></jats:sub> and BaFe<jats:sub>0.75</jats:sub>Ta<jats:sub>0.25</jats:sub>O<jats:sub>3−<jats:italic>δ</jats:italic></jats:sub>, designed from <jats:italic>ab-initio</jats:italic> calculations to fulfill different requisites of cathode materials for solid-oxide fuel cells (SOFC), were prepared and studied from the structural point of view from neutron powder diffraction (NPD) data. They are both derivatives of BaFeO<jats:sub>3</jats:sub> hexagonal perovskite (space group <jats:italic>P6</jats:italic><jats:sub><jats:italic>3</jats:italic></jats:sub>/<jats:italic>mmc</jats:italic>), typified as the 6H polytype, stabilized when the perovskite tolerance factor slightly overpasses the unity. Whereas BaFe<jats:sub>0.875</jats:sub>Re<jats:sub>0.125</jats:sub>O<jats:sub>3−<jats:italic>δ</jats:italic></jats:sub> keeps this structural type, as demonstrated in this crystallographic study from NPD data at 295 and 4 K, with unit-cell parameters <jats:italic>a</jats:italic> = 5.70177(7); <jats:italic>c</jats:italic> = 14.0334(2) Å at 295 K, the second material, BaFe<jats:sub>0.75</jats:sub>Ta<jats:sub>0.25</jats:sub>O<jats:sub>3−<jats:italic>δ</jats:italic></jats:sub>, is cubic and can be defined in the <jats:italic>Pm-3m</jats:italic> space group, corresponding of the perovskite arystotype, with <jats:italic>a</jats:italic> = 4.05876(3) Å. A conspicuous oxygen deficiency is observed, with a refined stoichiometry of 2.86(3) per formula unit. The anisotropic displacement factors for oxygen atoms in this last material are flattened disks perpendicular to the (Fe,Ta)-O-(Fe,Ta) direction, suggesting a dynamic tilting of the octahedra that could be related to the oxygen motion via oxygen vacancies across the structure. This is a pre-requisite for functional mixed-ionic-electronic (MIEC) materials performing as cathodes in SOFC.</jats:p>