High purity superconducting compositions and methods for their fabrication

This paper describes the method of producing a superconducting material precursor of high purity having the general formula MBA2Cu3O7-x where x is from about 0 to 0. It comprises: providing a first aqueous solution comprising M and copper nitrates wherein M is selected from the group consisting of yttrium and the rare earth elements; heating the first solution to a temperature of from about 85 to 100 degrees C; providing a second aqueous solution comprising barium hydroxide; heating the second solution to a temperature of from about 80 to 110 degrees C; mixing the solutions whereby a precipitate forms; and removing the precipitate from the mixture; whereby a high purity precursor suitable for use in making a high tc superconductor results