Novel resistive interfilamentary carbonate barriers in multifilamentary low AC loss Bi(2223)-tapes

Reducing the coupling losses, one component of the AC losses in BSCCO tapes, a novel idea for a conductor geometry was developed introducing resistive layers of strontium carbonate in the matrix. Two different preparation methods were applied to introduce the layers in the interfilamentary section, a dip coating technique and a double tube method. Additionally a new ring bundle technique for multifilamentary Bi(2223)-tapes was developed based on a tape composite structure similar to a Rutherford cable with the possibility of realizing practically fully transposed filaments and with a central resistive strontium carbonate core. The achieved current densities of 10 kAcm/sup -2/ with a twist pitch of 10 mm qualifies this new conductor as a very promising alternative concept. We report on the preparation method and the superconducting properties of those tapes.