Fabrication of YBCO-LPE Film on Metal Using MgO-Saturated Solution

Abstract

The fabrication process of RE123 system superconducting tape on Hastelloy substrates was developed using the liquid phase epitaxy (LPE) process. To prevent reactions between metal substrates and the Ba₃Cu₅O_x solution, we selected an MgO buffer layer for the solution saturated with MgO. The Hastelloy substrate was completely dissolved into the melt without addition of MgO. However, the Hastelloy substrate survived in the MgO saturated solution. The modified LPE process was developed which is the Y123 LPE growth using the Y123 layer saturated with MgO as the second buffer layer to prevent dissolution of the first MgO buffer layer into the melt. Using the MgO single crystal substrates, we got the YBa₂Cu₃O_x film on the YBa₂(Cu, Mg)₃O_x/MgO substrates. Finally, the YBa₂(Cu, Mg)₃O layer was grown on MgO/Hastelloy substrates from the solution saturated with MgO.