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Author Colino, J. ♦ Sacedon, J. L. ♦ Del Olmo, L. ♦ Vincent, J.L.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ BARIUM OXIDES ♦ SINTERING ♦ COPPER OXIDES ♦ YTTRIUM OXIDES ♦ AUGER ELECTRON SPECTROSCOPY ♦ DIFFUSION ♦ FRACTURES ♦ GRAIN BOUNDARIES ♦ HEAT TREATMENTS ♦ HIGH-TC SUPERCONDUCTORS ♦ OXYGEN ♦ POLYCRYSTALS ♦ STOICHIOMETRY ♦ SURFACES ♦ ALKALINE EARTH METAL COMPOUNDS ♦ BARIUM COMPOUNDS ♦ CHALCOGENIDES ♦ COPPER COMPOUNDS ♦ CRYSTAL STRUCTURE ♦ CRYSTALS ♦ ELECTRON SPECTROSCOPY ♦ ELEMENTS ♦ FABRICATION ♦ FAILURES ♦ MICROSTRUCTURE ♦ NONMETALS ♦ OXIDES ♦ OXYGEN COMPOUNDS ♦ SPECTROSCOPY ♦ SUPERCONDUCTORS ♦ TRANSITION ELEMENT COMPOUNDS ♦ YTTRIUM COMPOUNDS ♦ Ceramics, Cermets, & Refractories- Physical Properties
Abstract Auger electron spectroscopy depth profiles from different surfaces of the YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} polycrystalline 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.
ISSN 07342101
Educational Use Research
Learning Resource Type Article
Publisher Date 1990-11-01
Publisher Place United States
Journal Journal of Vacuum Science and Technology, A
Volume Number 8
Issue Number 6


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