Open AccessEffect of lead content on the formation of the 2223 phase
Author(s) -
M. Lelovic,
P. Krishnaraj,
N. G. Eror,
W.A. Soffa
Publication year - 1993
Language(s) - English
Resource type - Reports
DOI - 10.2172/395625
Subject(s) - phase (matter) , dissolution , partial pressure , superconductivity , analytical chemistry (journal) , content (measure theory) , oxygen , materials science , pellet , liquid phase , chemistry , thermodynamics , chromatography , condensed matter physics , physics , organic chemistry , mathematical analysis , mathematics , composite material
Freeze-dried powders have been used for the formation of the high Tc (110 K) superconducting phase in the Bi-Sr-Ca-Cu-O system. Effects of lead content and oxygen partial pressure were investigated. It was shown that lead content and oxygen partial pressure were affecting liquid phase formation. Lead content affected the dissolution of the 2212 phase into the liquid phase from which the 2223 high Tc superconducting phase forms. Powder reacted as pellet with Bi{sub 1.8}Pb{sub 0.4}Sr{sub 2.0}Ca{sub 2.0}Cu{sub 3.0}O{sub x} composition shows essentially phase pure 2223 after 12 hrs at 845{degrees} C in 7%O{sub 2}