Synthesis of Pb-Based Cuprate Superconductors by the Sol-Gel Method

The sol-gel method provides a convenient means for preparing lead cuprates of the types $Pb_2Sr_{2-y}Ba_yLn{1-x}Ca_xCu_30_8$ (2213 type) with Ln = Y or rare earth and $Pb_{1-z}Cu_zSr_{2-y}Ba_yY_{1-x}Ca_xCu_20_7$ (1212 type).Superconducting compositions of these two families showing sharp transitions can be prepared in a reproducible manner by this method