Resumen de A Convenient, One-Step Synthesis of YBa2CU3O7-x Superconductors:: An Undergraduate Inorganic/Materials Laboratory Experiment
Connie D. Cogdell, Darcey G. Wayment, Dominick J. Casadonte Jr., Kim A. Kubat-Martin.
The preparation of YBa2Cu3O7-x (Y-123) high-temperature superconductor material generally requires repeated grinding and heating of binary oxide or carbonate reactants to inhibit the formation of the low-melting insulating phases BaCuO2 and Y2BaCuO5 (Y-211). This multiple processing renders the synthesis tedious and somewhat impractical for use in an undergraduate laboratory setting. We describe here a convenient, single-step synthesis of Y-123 from the ternary oxide precursors Y2Cu2O5 and BaCuO2. This reaction can be accomplished in a single 24 hour period and does not suffer from the formation of eutectic phases. The precursor materials can be prepared and stored in advance of the experiment. Students are also exposed to the concepts of ternary phase equilibria and other concepts of modem material processing.
