Electrosynthesis of NbTi and Nb3Sn Superconductors from Oxide Precursors in CaCl2-Based Melts


  • The authors are grateful to the EPSRC for financial support and to Dr. B. A. Glowacki (University of Cambridge) for useful discussions and for arranging for the superconducting properties to be measured.


NbTi and Nb3Sn superconductors have been synthesized directly from the oxides by electro-deoxidation, where the cathode is made by placing an intimate mixture of the sintered oxide in a molten bath of calcium chloride and sodium chloride. The favored cathodic reaction is the removal of the oxygen from the oxides to form the superconducting intermetallic alloys and not the deposition of calcium. The superconducting properties of the intermetallic compounds are confirmed.