|
authors |
Boulahya, K; Hassan, M; Gil, DM; Romero, J; Herrero, AG; Martin, SG; Amador, U |
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nationality |
International |
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journal |
JOURNAL OF MATERIALS CHEMISTRY A |
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keywords |
OXIDE FUEL-CELLS; COMPLEX MAGNETIC-BEHAVIOR; MN/CO ATOMIC ORDER; ELECTRICAL-CONDUCTIVITY; K2NIF4-TYPE STRUCTURE; THERMAL-EXPANSION; CRYSTAL-STRUCTURE; SOLID-SOLUTION; TEMPERATURE; CATHODES |
|
abstract |
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 Omega cm(2) at 700 degrees 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 (T-C similar to 121 K) within an ordered Co2+/Mn4+ atomic configuration, whereas at lower temperature (similar to 21 K) a spin glass state occurs. |
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publisher |
ROYAL SOC CHEMISTRY |
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issn |
2050-7488 |
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year published |
2015 |
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volume |
3 |
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issue |
45 |
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beginning page |
22931 |
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ending page |
22939 |
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digital object identifier (doi) |
10.1039/c5ta05464h |
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web of science category |
Chemistry, Physical; Energy & Fuels; Materials Science, Multidisciplinary |
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subject category |
Chemistry; Energy & Fuels; Materials Science |
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unique article identifier |
WOS:000365011400049
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