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Nitrogen adsorption measured at 77K was used to characterize the energetic and geometrical heterogeneity of high-temperature superconductor surfaces. The porosity of the solids (specific surface area, radii and volume of the pores, as well as the pore-size distribution function) was determined from adsorption data for a series of oxide superconductors ((RE) 1.85 Ce 0 ...
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