| 摘要 |
A method for preparing a BSCCO-2223 oxide superconducting article includes annealing an oxide superconductor article comprised of BSCCO-2223 oxide superconductor at a temperature selected from the range of about 500 DEG C.</=T</=787 DEG C. and an annealing atmosphere having an oxygen pressure selected from within the region having a lower bound defined by the equation, PO2(lower)>/=3.5x1010exp(-32,000/T+273) and an upper bound defined by the equation, PO2(upper)</=1.1x1012exp(-32,000/T+273). The article is annealed for a time sufficient to provide at least a 10% increase in critical current density as compared to the critical current density of the pre-anneal oxide superconductor article. An oxide superconductor having the formula Bi2-yPbySr2Ca2Cu3O10+x, where 0</=x</=1.5 and where 0</=y</=0.6 is obtained, the oxide superconductor characterized by a critical transition temperature of greater than 111.0K, as determined by four point probe method. |
