Combustion process for the synthesis of YBa < inf > 2 < /inf > Cu < inf > 3 < /inf > O < inf > 7-δ < /inf > high-T < inf > c < /inf > superconductor

Abstract

Synthesis of superconducting YBa2Cu3O7-δ has been achieved by a rapid and energy saving process starting with nitrate precursors. The process involves the preparation of an intimate mixture of Y, Ba and Cu oxides by the combustion of a mixture of the corresponding metal nitrates with urea. The reaction takes place in just 5 min at 525 ° C. The oxide mixture is then heat treated for relatively short durations to obtain the superconducting material. © 1989.