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Formation of Yttrium Barium Cuprate Powder at Low Temperatures
Author(s) -
Lay Kenneth W.
Publication year - 1989
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.1151-2916.1989.tb06200.x
Subject(s) - yttrium , barium , oxidizing agent , reducing atmosphere , barium carbonate , cuprate , tetragonal crystal system , materials science , oxygen , inorganic chemistry , carbonate , copper , doping , mineralogy , phase (matter) , analytical chemistry (journal) , chemistry , oxide , metallurgy , raw material , optoelectronics , organic chemistry , chromatography
Yttrium barium cuprate can be formed at temperatures below 800°C from mixed oxides and carbonate if a low‐oxygen‐pressure atmosphere is used. This eliminates the formation of a high‐oxygen‐content nonsuperconducting phase which has been previously shown to form at lower temperatures. Reaction of barium carbonate and the oxides of copper and yttrium at temperatures as low as 750°C in reducing atmospheres is shown to form tetragonal YBa 2 Cu 3 O x with x about 6. This compound can then be oxidized by cooling in an oxidizing atmosphere to obtain the desired x value of about 7.