Abstract
Equilibrium stable compounds U(Ca,Sr) 2O 5 and U(Ca,Sr) 3O 6, have been identified in the U Bi Sr Ca Cu O system. These compounds have been synthesised and added to Bi-2223/Ag composite tapes in progressively greater amounts. Bi-2223/Ag doped with these compounds using compositions closer to the equilibrium composition has been shown to have superior superconducting properties to that doped with Uranium oxide compounds. The effects of chemical degradation by Uranium compound dopants via Strontium and Calcium removal from the Bi-2223 structure have been indirectly determined by I c measurements. Losses in I c can be minimised by stabilising Uranium into appropriate compounds.
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