Premium
Vapor Pressures of Bismuth, Lead, and Copper Components in Bi 2 Sr 1.7 CaCu 2 O y and Bi 1.7 Pb 0.3 Sr 1.7 Ca 2 Cu 3 O y Superconductor Ceramics
Author(s) -
Sata Toshiyuki,
Sakai Kazuo,
Tashiro Suguru
Publication year - 1992
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.1151-2916.1992.tb04145.x
Subject(s) - bismuth , vapor pressure , analytical chemistry (journal) , copper , water vapor , atmospheric temperature range , high temperature superconductivity , mineralogy , chemistry , superconductivity , materials science , metallurgy , thermodynamics , condensed matter physics , environmental chemistry , physics , organic chemistry
The vapor pressures of the Bi system superconductor oxides Bi 2 Sr 1.7 CaCu 2 O y (BSCCO) and Bi 1.7 Pb 0.3 Sr 1.7 Ca 2 Cu 3 O y (BPSCCO) were determined by the transpiration method in atmospheres of O 2 , air, and N 2 , in the temperature range 730° to 82 0°C. The Bi/Cu atomic ratios of the vapor increased from 0.8 to 4.6 with increasing temperature for BSCCO, and the Bi/Cu/Pb ratio was 1.1/1/72 for BPSCCO at 800°C in O 2 . Vapor pressures for the vapor species Cu, CuO, Bi 4 O 6 , PbO, and Pb 2 O 2 were calculated using the literature values. Vapor pressures for Cu were higher and those for both Bi and Pb lower than values estimated from the pure oxides. These values are discussed in the present paper in relation to crystal structure.