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Effect of Annealing on the Surface Microstructure of Y‐Ba‐Cu‐O Superconducting Ceramics
Author(s) -
Sinn DongSook,
Kim Moon G.
Publication year - 1991
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1991.tb07160.x
Subject(s) - annealing (glass) , materials science , microstructure , ceramic , oxalate , superconductivity , electroceramics , precipitation , mineralogy , phase (matter) , high temperature superconductivity , analytical chemistry (journal) , metallurgy , chemistry , inorganic chemistry , condensed matter physics , fabrication , physics , organic chemistry , chromatography , meteorology , medicine , microfabrication , alternative medicine , pathology
Precusors to the YBa 2 Cu 3 O 7‐δ material were prepared by both the oxalate precipitation method and conventional ceramic processing. Second‐phase grains were observed to develop on the exposed fracture surface during annealing at 500° to 600°C in an ambient atmosphere. The second‐phase grains were identified to be BaCO 3 using EDX and XRD. The liquid phase, which was formed because of local chemical inhomogeneity in the Y‐Ba‐Cu‐O system, contributed to the formation of second‐phase grains as a source of Ba.