Fabrication and Microstructural Development of Ag-Clad TlBa2Ca2Cu3Ox Tapes
One of the most successful fabrication techniques for high-Tc superconductors is the powder-in-tube method, which consists of packing superconductor powder into a silver tube and mechanically deforming the composite into a tape. Microstructural development and critical current density (Jc) have been explored extensively for Y−, Bi−, and Tl− based superconductors. Early studies on YBa2Cu3O7 have shown that Je is limited by weak links that restrict current transport across grain boundaries.1 Low Jc (600 A/cm2 at 77 K) has been attributed to inadequate grain alignment which results in weak-link behavior.2
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