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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 fluorescencemeasurements 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 contentnear the sample edges in the b-axis direction. A parallel study on anelectrically contacted sample has indirectly detected the O loss, observingboth 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 Cucation migration in the same direction.Comment: RevTeX 4, 10 pages, 3 figure

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