Evidence of ion diffusion at room temperature in microcrystals of the Bi2Sr2CaCu2O8+delta superconductor

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We have studied Bi-2212 microcrystals aged at ambient conditions for 40 days. Combined x-ray absorption near edge structure and x-ray fluorescence measurements with micrometer space resolution show both an increase of Cu$^{+}$ with respect to Cu$^{2+}$ and an enrichment in Cu vs Bi and Sr cation content near the sample edges in the b-axis direction. A parallel study on an electrically contacted sample has indirectly detected the O loss, observing both a resistivity increase and an increase in sample thickness near the edges. We conclude that the O out-diffusion along the b-axis is accompanied by Cu cation migration in the same direction.
RevTeX 4, 10 pages, 3 figures

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Superconductivity, Materials Science

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http://salesiana.dossiersoluciones.com/handle/123456789/26482

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0506198
 http://arxiv.org/abs/cond-mat/0506198
 Appl. Phys. Lett. 86, 213116, (2005)
 doi:10.1063/1.1938251

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arXiv