Auger electron spectroscopy depth profile study in fracture surfaces of sinterized YBa2Cu3O7−x

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Abstract
Auger electron spectroscopy depth profiles from different surfaces of the YBa2Cu3O7−x polycristalline compound, such as fracture and polished fracture surface of sintered ceramics, fracture of isostatically pressed powder and powder surface, have been measured. For the first time in this material, a study of the apparent enrichments in the Auger profiles compared with a preferential sputtering model in nonsimple oxides, recently tested in other perovskite oxide compound, is reported. These data show an oxygen surface release and an intergrain copper enrichment as consequence of thermal processing of the material. Thus, the existence of different stoichiometry in the grain boundaries as an additional contribution to the formation of weak links appears confirmed.

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