A recent preparation method by citrate synthesis in combination with pyrolysis has been applied to the new high-Tc superconductors. A step-by-step procedure is given to obtain the ultra-fine and homogeneous powder. X-ray diffraction analyses were performed to characterise the powder and to study the influence of the calcination temperature. Resistance measurements exhibit complete superconductivity at 91.2 K.
Blank, D. H. A., Kruidhof, H., & Flokstra, J. (1988). Preparation of YBa2Cu3O7- by citrate synthesis and pyrolysis. Journal of physics D: applied physics, 21(1), 226-227. https://doi.org/10.1088/0022-3727/21/1/036