Exploring the physical properties of Eu<sub>2</sub>SrCo<sub>1.5</sub>Mn<sub>0.5</sub>O<sub>7</sub>, a new n = 2 member of the Ruddlesden–Popper series (Eu,Sr)<sub>n+1</sub>(Co,Mn)<sub>n</sub>O<sub>3n+1</sub>
- Boulahya, Khalid 12345
- Hassan, Manar 12345
- Gil, Daniel Muñoz 12345
- Romero, Julio 458910
- Herrero, Adrián Gómez 4567
- Martin, Susana García 12345
- Amador, Ulises 511121314
- 1 Departamento de Química Inorgánica
- 2 Facultad Ciencias Químicas
- 3 Univ. Complutense
- 4 E-28040 Madrid
- 5 Spain
- 6 Centro Nacional de Microscopía Electrónica
-
7
Universidad Complutense de Madrid
info
- 8 CAI Técnicas Físicas
- 9 Facultad de Ciencias Físicas
- 10 Univ. Complutense de Madrid
- 11 Departamento de Química
- 12 Facultad de Farmacia
-
13
Universidad CEU San Pablo
info
- 14 Madrid
ISSN: 2050-7488, 2050-7496
Année de publication: 2015
Volumen: 3
Número: 45
Pages: 22931-22939
Type: Article
D'autres publications dans: Journal of Materials Chemistry A
Résumé
A new oxide of the Ruddlesden–Popper series has been isolated and structurally characterized in the Eu–Sr–Co–Mn–O system. X-ray diffraction and electron microscopy show that polycrystalline Eu2SrCo1.5Mn0.5O7 constitutes the n = 2 member of a homologous series, the essential feature of which is the existence of two connected Co/Mn octahedral layers, separated by Eu atoms. Electrochemical studies show that the area-specific resistance of this compound is 0.15 Ω cm2 at 700 °C in air, a performance which is comparable to that of the best state-of-the-art materials used as cathodes in intermediate temperature solid oxide fuel cells. Below 150 K the title material presents two different magnetic phenomena. The first one corresponds to the formation of ferromagnetic nanoclusters (TC ∼ 121 K) within an ordered Co2+/Mn4+ atomic configuration, whereas at lower temperature (∼21 K) a spin glass state occurs.
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