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

Truccato, M.; Lamberti, C.; Prestipino, C.; Agostino, A.
May 2005
Applied Physics Letters;5/23/2005, Vol. 86 Issue 21, p213116
Academic Journal
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 Cu2+ 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 outdiffusion along the b axis is accompanied by Cu cation migration in the same direction.


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