Advanced Energy Materials Group
First generation (1G) Bi-Sr-Ca-Cu-O HTS wire development 1986-2000
1G work at BNL in 1986-2000 relied on a strong Laboratory -
industry cooperation that was directed toward the development of practical
Bi-2223 superconductor tapes. The relationships among preparation methods,
structure, and practical superconducting properties (critical currents) were
rigorously investigated. Sample sources included BNL-produced tapes,
prototype commercial tapes (SuperPower), and near-production tapes (AmSC).
The early work  involved the first X-ray diffraction investigation of intact tapes, using relatively high energy photons at BNL NSLS. The experiment used a unique feature of synchrotron radiation to penetrate the thick layer of silver and obtain structural information about BSCCO core. It was discovered that, in these prototypes, as the texture of the Bi-2223 improves, the critical current tends to increase.
The next step was the development of an in situ furnace in which x-ray diffraction could be performed during phase formation . Variations of reaction processes were tested, and effects on reactions, final product structure, and superconducting properties were documented. This knowledge was augmented thorough microstructural and transmission electron diffraction studies on reacted tapes .
Last Modified: February 3, 2010
Please forward all questions about this site to: Robert Sundling