Reversible nano-structuring of SrCrO3-Î´ through oxidation and reduction at low temperature.

Zhang, K H L; Sushko, P V; Colby, R; Du, Y; Bowden, M E; Chambers, S A

Zhang, K H L; Sushko, P V; Colby, R; Du, Y; Bowden, M E; Chambers, S A.

Afiliación

Zhang KH; Physical Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352, USA.
Sushko PV; Physical Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352, USA.
Colby R; 1] Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99352, USA [2] Present address: ExxonMobil Research and Engineering Company, Annandale, New Jersey 08801, USA.
Du Y; Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99352, USA.
Bowden ME; Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99352, USA.
Chambers SA; Physical Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352, USA.

Nat Commun ; 5: 4669, 2014 Aug 18.

Article en En | MEDLINE | ID: mdl-25131307

RESUMEN

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-Î´). 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+) and separated by ~1 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-) diffusion along these quasi-two-dimensional nanostructures is significantly lower than that in cubic SrCrO(3-Î´). This property is of considerable relevance to solid oxide fuel cells in which fast O(2-) diffusion reduces the required operating temperature.

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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nat Commun Asunto de la revista: BIOLOGIA / CIENCIA Año: 2014 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido

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