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Cascos V, Chivite Lacaba M, Biskup N, Fernández-Díaz MT, Alonso JA. SrMo 0.9O 3-δ Perovskite with Segregated Ru Nanoparticles Performing as Anode in Solid Oxide Fuel Cells. ACS Appl Mater Interfaces 2024; 16:17474-17482. [PMID: 38563237 PMCID: PMC11009920 DOI: 10.1021/acsami.3c19099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Revised: 03/19/2024] [Accepted: 03/19/2024] [Indexed: 04/04/2024]
Abstract
A new anode material, Ru-SrMo0.9O3-δ, with a perovskite structure and segregated metallic Ru, has been tested in an intermediate-temperature solid oxide fuel cell (IT-SOFC) in an electrolyte-supported configuration giving substantial power densities as high as 840 mW/cm2 at 850 °C using pure H2 as fuel. This material has been prepared by the citrate method and structurally and microstructurally characterized at room temperature by different techniques such as X-ray diffraction (XRD), neutron powder diffraction (NPD), scanning electron microscopy (SEM), and scanning transmission electron microscopy (STEM). NPD was very useful to determine oxygen positions and vacancies, unveiling a cubic and oxygen-deficient perovskite SrMo0.9O3-δ oxide with a Pm-3m space group and potential ionic mobility. On the other hand, SEM and STEM studies have allowed to identify metallic segregated Ru nanoparticles providing the material with an excellent catalytic activity. Other properties such as the thermal expansion coefficient (TEC) and chemical compatibility with other cell components or electrical conductivity have also been studied to understand the excellent performance of this material as anode in IT-SOFC and correlate it with the crystallographic structure.
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Affiliation(s)
- Vanessa Cascos
- Departamento
de Química Inorgánica, Universidad
Complutense de Madrid, Madrid E-28040, Spain
- Instituto
de Ciencia de Materiales de Madrid, C.S.I.C., Cantoblanco, Madrid E-28049, Spain
| | - Mónica Chivite Lacaba
- Departamento
de Química Inorgánica, Universidad
Complutense de Madrid, Madrid E-28040, Spain
- Instituto
de Ciencia de Materiales de Madrid, C.S.I.C., Cantoblanco, Madrid E-28049, Spain
| | - Neven Biskup
- Departamento
de Física de Materiales & Instituto Pluridisciplinar, Universidad Complutense de Madrid, Madrid 28040, Spain
| | | | - José Antonio Alonso
- Instituto
de Ciencia de Materiales de Madrid, C.S.I.C., Cantoblanco, Madrid E-28049, Spain
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2
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Scott EA, Mitoudi Vagourdi E, Johnsson M, Cascos V, John F, Pickup D, Chadwick AV, Djani H, Bousquet E, Zhang W, Halasyamani PS, McCabe EE. Bi 2CoO 2F 4-A Polar, Ferrimagnetic Aurivillius Oxide-Fluoride. Chem Mater 2022; 34:9775-9785. [PMID: 36397835 PMCID: PMC9648175 DOI: 10.1021/acs.chemmater.2c02745] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Revised: 10/03/2022] [Indexed: 06/16/2023]
Abstract
Aurivillius oxides have been a research focus due to their ferroelectric properties, but by replacing oxide ions by fluoride, divalent magnetic cations can be introduced, giving Bi2 MO2F4 (M = Fe, Co, and Ni). Our combined experimental and computational study on Bi2CoO2F4 indicates a low-temperature polar structure of P21 ab symmetry (analogous to ferroelectric Bi2WO6) and a ferrimagnetic ground state. These results highlight the potential of Aurivillius oxide-fluorides for multiferroic properties. Our research has also revealed some challenges associated with the reduced tendency for polar displacements in the more ionic fluoride-based systems.
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Affiliation(s)
- Euan A.
S. Scott
- School
of Physical Sciences, University of Kent, Kent, Canterbury CT2 7NH, U.K.
| | - Eleni Mitoudi Vagourdi
- Department
of Materials and Environmental Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Mats Johnsson
- Department
of Materials and Environmental Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Vanessa Cascos
- School
of Physical Sciences, University of Kent, Kent, Canterbury CT2 7NH, U.K.
| | - Filbin John
- School
of Physical Sciences, University of Kent, Kent, Canterbury CT2 7NH, U.K.
| | - Dave Pickup
- School
of Physical Sciences, University of Kent, Kent, Canterbury CT2 7NH, U.K.
| | - Alan V. Chadwick
- School
of Physical Sciences, University of Kent, Kent, Canterbury CT2 7NH, U.K.
| | - Hania Djani
- Centre
de Développement des Technologies Avancées, cité 20 aout 1956, Baba Hassan, Alger 16081, Algeria
| | - Eric Bousquet
- Theoretical
Materials Physics, Q-MAT, CESAM, Université
de Liège, Allée
6 août, 17, B-4000, Sart Tilman, Liège 4000, Belgium
| | - Weiguo Zhang
- Department
of Chemistry, University of Houston, 112 Fleming Building, Houston, Texas 77204, United States
| | - P. Shiv Halasyamani
- Department
of Chemistry, University of Houston, 112 Fleming Building, Houston, Texas 77204, United States
| | - Emma E. McCabe
- School
of Physical Sciences, University of Kent, Kent, Canterbury CT2 7NH, U.K.
- Department
of Physics, Durham University, South Road, Durham DH1 3LE, U.K.
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García-Ramos C, Cascos V, Prado-Gonjal J, Schmidt R, Fernández-Díaz MT, Krezhov K, Alonso JA. BaFe 0.875Re 0.125O 3−δ
and BaFe 0.75Ta 0.25O 3−δ
as potential cathodes for solid-oxide fuel-cells: a structural study from neutron diffraction data. Z KRIST-CRYST MATER 2022. [DOI: 10.1515/zkri-2022-0027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
In this work, two new perovskites of composition BaFe0.875Re0.125O3−δ
and BaFe0.75Ta0.25O3−δ
, designed from ab-initio 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 BaFeO3 hexagonal perovskite (space group P6
3
/mmc), typified as the 6H polytype, stabilized when the perovskite tolerance factor slightly overpasses the unity. Whereas BaFe0.875Re0.125O3−δ
keeps this structural type, as demonstrated in this crystallographic study from NPD data at 295 and 4 K, with unit-cell parameters a = 5.70177(7); c = 14.0334(2) Å at 295 K, the second material, BaFe0.75Ta0.25O3−δ
, is cubic and can be defined in the Pm-3m space group, corresponding of the perovskite arystotype, with a = 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.
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Affiliation(s)
- Crisanto García-Ramos
- Instituto de Ciencia de Materiales de Madrid, CSIC , Cantoblanco 28049 Madrid , Spain
| | - Vanessa Cascos
- Instituto de Ciencia de Materiales de Madrid, CSIC , Cantoblanco 28049 Madrid , Spain
- Departamento de Química Inorgánica , Universidad Complutense de Madrid , E-28040 , Madrid , Spain
| | - Jesús Prado-Gonjal
- Departamento de Química Inorgánica , Universidad Complutense de Madrid , E-28040 , Madrid , Spain
| | - Rainer Schmidt
- Departamento de Física de Materiales , GFMC, Universidad Complutense de Madrid , E-28040 , Madrid , Spain
| | | | - Kiril Krezhov
- Institute for Nuclear Research and Nuclear Energy (INRNE) , Tsarigradsko Chaussee 72, BG-1784 Sofía , Bulgaria
| | - José Antonio Alonso
- Instituto de Ciencia de Materiales de Madrid, CSIC , Cantoblanco 28049 Madrid , Spain
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Cascos V, Fernández-Díaz MT, Alonso JA. Al-Doped SrMoO 3 Perovskites as Promising Anode Materials in Solid Oxide Fuel Cells. Materials (Basel) 2022; 15:ma15113819. [PMID: 35683119 PMCID: PMC9181521 DOI: 10.3390/ma15113819] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Revised: 05/18/2022] [Accepted: 05/24/2022] [Indexed: 11/16/2022]
Abstract
Two perovskite materials with SrMo1−xAlxO3−δ (x = 0.1, 0.2) compositions have been synthesized by reduction from the corresponding scheelite phases, with SrMo1−xAlxO4−δ stoichiometry; the pertinent characterization shows that the defective perovskites can be used as anode materials in solid oxide fuel cells, providing maximum output power densities of 633 mW/cm2 for x = 0.2. To correlate structure and properties, a neutron powder diffraction investigation was carried out for both perovskite and scheelite phases. Both perovskites are cubic, defined in the Pm-3m space group, displaying a random distribution of Mo and Al cations over the 1a sites of the structure. The introduction of Al at Mo positions produced conspicuous amounts of oxygen vacancies in the perovskite, detected by neutrons. This is essential to induce ionic diffusion, providing a mixed ionic and electronic conduction (MIEC), since in MIEC electrodes, charge carriers are combined in one single phase and the ionic conductivity can be one order of magnitude higher than in a conventional material. The thermal expansion coefficients of the reduced and oxidized samples demonstrated that these materials perfectly match with the La0.8Sr0.2Ga0.83Mg0.17O3−δ electrolyte, La0.4Ce0.6O2−δ buffer layer and other components of the cell. Scanning electron microscopy after the test in a real solid oxide fuel cell showed a very dense electrolyte and porous electrodes, essential requirements for this type of fuel. SrMo1−xAlxO3−δ perovskites are, thus, a good replacement of conventional biphasic cermet anodes in solid oxide fuel cells.
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Affiliation(s)
- Vanessa Cascos
- Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, Cantoblanco, E-28049 Madrid, Spain;
- Departamento de Química Inorgánica, Universidad Complutense de Madrid, E-28040 Madrid, Spain
- Correspondence: ; Tel.: +34-91-394-4355
| | | | - José Antonio Alonso
- Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, Cantoblanco, E-28049 Madrid, Spain;
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Larralde AL, Troncoso L, Alvarez-Galvan C, Cascos V, Fernandez-Díaz MT, Alonso JA. Defective Sr 0.9Mo 0.9O 3−δ perovskites with exsolved Ni nanoparticles as high-performance composite anodes for solid-oxide fuel cells. NEW J CHEM 2021. [DOI: 10.1039/d1nj02295d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An A-site deficient perovskite with metallic Ni in exsolution, Ni–Sr0.9Mo0.9O3−δ, has been prepared, characterized and tested as an anode material in intermediate-temperature solid-oxide fuel cells (IT-SOFCs).
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Affiliation(s)
- A. L. Larralde
- Laboratorio de Cristalografía Aplicada
- Escuela de Ciencia y Tecnología
- Universidad de San Martín
- Martín de Irigoyen 3100
- Buenos Aires
| | - L. Troncoso
- Instituto de Materiales y Procesos Termomecánicos
- Universidad Austral de Chile
- General Lagos, 2086
- 5111187 Valdivia
- Chile
| | - C. Alvarez-Galvan
- Instituto de Catálisis y Petroleoquímica, C.S.I.C
- Cantoblanco
- Madrid
- Spain
| | - V. Cascos
- Instituto de Ciencia de Materiales de Madrid, C.S.I.C
- Cantoblanco
- Madrid
- Spain
- Departamento de Química Inorgánica
| | | | - J. A. Alonso
- Instituto de Ciencia de Materiales de Madrid, C.S.I.C
- Cantoblanco
- Madrid
- Spain
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6
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Cascos V, Martínez-Coronado R, Fernández-Díaz MT, Alonso JA. Topotactic Oxidation of Perovskites to Novel SrMo 1-xM xO 4-δ (M = Fe and Cr) Deficient Scheelite-Type Oxides. Materials (Basel) 2020; 13:ma13194441. [PMID: 33036294 PMCID: PMC7578960 DOI: 10.3390/ma13194441] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Revised: 09/24/2020] [Accepted: 09/29/2020] [Indexed: 11/24/2022]
Abstract
New polycrystalline SrMo1−xMxO4−δ (M = Fe and Cr) scheelite oxides have been prepared by topotactical oxidation, by annealing in air at 500 °C, from precursor perovskites with the stoichiometry SrMo1−xMxO3−δ (M = Fe and Cr). An excellent reversibility between the oxidized Sr(Mo,M)O4−δ scheelite and the reduced Sr(Mo,M)O3−δ perovskite phase accounts for the excellent behavior of the latter as anode material in solid-oxide fuel cells. A characterization by X-ray powder diffraction (XRD) and neutron powder diffraction (NPD) has been carried out to determine the crystal structure features. The scheelite oxides are tetragonal, space group I41/a (No. 88). The Rietveld-refinement from NPD data at room temperature shows evidence of oxygen vacancies in the structure, due to the introduction of Fe3+/Cr4+ cations in the tetrahedrally-coordinated B sublattice, where Mo is hexavalent. A thermal analysis of the reduced perovskite (SrMo1−xMxO3−δ) in oxidizing conditions confirms the oxygen stoichiometry obtained by NPD data; the stability range of the doped oxides, below 400–450 °C, is lower than that for the parent SrMoO3 oxide. The presence of a Mo4+/Mo5+ mixed valence in the reduced SrMo1−xMxO3−δ perovskite oxides confers greater instability against oxidation compared with the parent oxide. Finally, an XPS study confirms the surface oxidation states of Mo, Fe, and Cr in the oxidized samples SrMo0.9Fe0.1O4-δ and SrMo0.8Cr0.2O4-δ.
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Affiliation(s)
- V. Cascos
- Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, Cantoblanco, E-28049 Madrid, Spain; (R.M.-C.); (J.A.A.)
- Departamento de Química Inorgánica, Universidad Complutense de Madrid, E-28040 Madrid, Spain
- Correspondence: ; Tel.: +34-91-394-5168; Fax: +34-91-394-4352
| | - R. Martínez-Coronado
- Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, Cantoblanco, E-28049 Madrid, Spain; (R.M.-C.); (J.A.A.)
| | | | - J. A. Alonso
- Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, Cantoblanco, E-28049 Madrid, Spain; (R.M.-C.); (J.A.A.)
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7
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Beqiri D, Cascos V, Roberts-Watts J, Clark ER, Bousquet E, Bristowe NC, McCabe EE. Tuning octahedral tilts and the polar nature of A-site deficient perovskites. Chem Commun (Camb) 2019; 55:2609-2612. [PMID: 30756099 DOI: 10.1039/c8cc10126d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Herein we highlight the ability to tune the structural chemistry of A-site deficient perovskite materials Ln1/3NbO3. Computational studies explore the balance between proper and hybrid-improper mechanisms for polar behaviour in these systems.
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Affiliation(s)
- Dashnor Beqiri
- School of Physical Sciences, University of Kent, Canterbury, Kent, CT2 7NH, UK
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8
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Frank CE, McCabe EE, Orlandi F, Manuel P, Tan X, Deng Z, Croft M, Cascos V, Emge T, Feng HL, Lapidus S, Jin C, Wu M, Li MR, Ehrlich S, Khalid S, Quackenbush N, Yu S, Walker D, Greenblatt M. Mn2CoReO6: a robust multisublattice antiferromagnetic perovskite with small A-site cations. Chem Commun (Camb) 2019; 55:3331-3334. [DOI: 10.1039/c9cc00038k] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Small A-site cations (Mn2+) induce complex magnetic structures in this transition-metal-only double perovskite.
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Affiliation(s)
- Corey E. Frank
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway
- USA
| | - Emma E. McCabe
- School of Physical Sciences, University of Kent, Canterbury
- Kent
- UK
| | - Fabio Orlandi
- ISIS Facility, STFC, Rutherford Appleton Laboratory
- Didcot
- UK
| | - Pascal Manuel
- ISIS Facility, STFC, Rutherford Appleton Laboratory
- Didcot
- UK
| | - Xiaoyan Tan
- Department of Chemistry and Biochemistry, George Mason University
- USA
| | - Zheng Deng
- Institute of Physics, School of Physics, University of Chinese Sciences
- Beijing
- P. R. China
| | - Mark Croft
- Department of Physics and Astronomy, Rutgers, The State University of New Jersey
- Piscataway
- USA
| | - Vanessa Cascos
- School of Physical Sciences, University of Kent, Canterbury
- Kent
- UK
| | - Thomas Emge
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway
- USA
| | - Hai L. Feng
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway
- USA
| | - Saul Lapidus
- Advanced Photon Source, Argonne National Laboratory
- USA
| | - Changqing Jin
- Institute of Physics, School of Physics, University of Chinese Sciences
- Beijing
- P. R. China
| | - MeiXia Wu
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University
- Guangzhou 510275
- China
| | - Man Rong Li
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University
- Guangzhou 510275
- China
| | | | - Syed Khalid
- NSLS-II, Brookhaven National Laboratory
- Upton
- USA
| | - Nicholas Quackenbush
- Materials Measurement Science Division, Material Measurement Laboratory, National Institute of Standards and Technology
- Gaithersburg
- USA
| | - Shuang Yu
- Institute of Physics, School of Physics, University of Chinese Sciences
- Beijing
- P. R. China
| | - David Walker
- Lamont Doherty Earth Observatory, Columbia University
- Palisades
- USA
| | - Martha Greenblatt
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway
- USA
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Alonso JA, Cascos V, Martinez-Coronado R, Sun C, Lopez C, Goodenough JB, Fernandez-Diaz MT. In situ characterization of energy materials by neutron diffraction. Acta Crystallogr A Found Adv 2017. [DOI: 10.1107/s2053273317094438] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Cascos V, Martínez-Coronado R, Alonso JA, Fernández-Díaz MT. Visualization by neutron diffraction of 2D oxygen diffusion in the Sr(0.7)Ho(0.3)CoO(3-δ) cathode for solid-oxide fuel cells. ACS Appl Mater Interfaces 2014; 6:9194-9200. [PMID: 24873238 DOI: 10.1021/am501297z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Sr0.7Ho0.3CoO3-δ oxide has been recently described as an excellent cathode material (1274 mW cm(-2) at 850 °C with pure H2 as fuel1) for solid oxide fuel cells (SOFCs) with LSGM as electrolyte. In this work, we describe a detailed study of its crystal structure conducted to find out the correlation between the excellent performance as a cathode and the structural features. The tetragonal crystal structure (e.g., I4/mmm) basically contains layers of octahedrally coordinated Co2O6 units alternated with layers of Co1O4 tetrahedra sharing corners. An "in situ" neutron power diffraction (NPD) experiment, between 25 and 800 °C, reveals the presence of a high oxygen deficiency affecting O4 oxygen atoms, with large displacement factors that suggest a large lability and mobility. Difference Fourier maps allow the visualization at high temperatures of the 2D diffusion pathways within the tetrahedral layers, where O3 and O4 oxygens participate. The measured thermal expansion coefficient is 16.61 × 10(-6) K(-1) between 300 and 850 °C, exhibiting an excellent chemical compatibility with the electrolyte.
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Affiliation(s)
- V Cascos
- Instituto de Ciencia de Materiales de Madrid, C.S.I.C. , Cantoblanco, E-28049 Madrid, Spain
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