THE POWDER-IN-TUBE PROCESSING AND PROPERTIES OF BI-2223

Substantial progress has been made in fabricating long lengths of flexible silver-clad high-critical-temperature superconductor tapes by the powder-in-tube method.Tapes with high critical current density (J(c)) that are attractive for electrical power and high-field magnet applications have been produced. At liquid helium (4.2 K) and liquid neon (27 K) temperatures, tapes made by this improved processing method yielded J(c) values greater than 1 00 kA/cm2 at zerofield; at liquid nitrogen temperatures (77 K), the J(c) values exceeded 40 kA/cm2. This article discusses the processing and properties of short-length tapes and of pancake coils made from long-length tapes via ''wind and react.''