High transition temperature superconducting compositions

A method for conducting an electrical current without electrical resistive losses, comprising the steps of:

• utilizing as a conductor a composition of matter comprising a Y—Ba—Cu—0 complex of nominal formula (Y1−xBax)aCubOy, wherein “x” is about 0.01 to 0.5, “a” is about 1 to 2, “b” is 1, and “y” is about 2 to about 4, containing a superconductive crystalline phase consisting essentially of Y, Ba, Cu and O which has zero electrical resistance at 77° K or above, said superconductive crystalline phase having a crystal structure uncharacteristic of that of a K2NiF4 crystal structure, and said superconductive crystalline phase being present in said composition of matter in a quantity sufficient to provide the composition with a diamagnetic signal at 4.2° K corresponding to at least 24% of the superconducting signal of a lead sample with similar dimensions;
• cooling said composition of matter to a temperature at or below that at which said crystalline phase becomes superconductive;
• and
• initiating a flow of electrical current within said composition of matter while maintaining said composition of matter at or below the temperature at which said crystalline phase becomes superconductive.

A method for conducting an electrical current without electrical resistive losses, comprising the steps of:

• utilizing as a conductor a composition of matter comprising a Y—Ba—Cu—O complex of nominal formula (Y1−xBax)3CubOy, wherein “x” is 0.4, “a” is 2, “b” is 1, and “y” is about 2 to about 4, containing a superconductive crystalline phase consisting essentially of Y, Ba, Cu and O which has zero electrical resistance at 77° K or above, said superconductive crystalline phase having a crystal structure uncharacteristic of that of a K2NiF4 crystal structure, and said superconductive crystalline phase being present in said composition of matter in a quantity sufficient to provide the composition with a diamagnetic signal at 4.2° K corresponding to about 24% of the superconducting signal of a lead sample with similar dimensions;
• cooling said composition of matter to a temperature at or below that at which said crystalline phase becomes superconductive;
• and
• initiating a flow of electrical current within said composition of matter while maintaining said composition of matter at or below the temperature at which said crystalline phase becomes superconductive.