Explosive shock compaction of furnace synthesized 1 micron size powders of YBa2Cu3O7 and Bi2Sr2CaCu2O8 have been carried out both in the planar and cylindrical geometries. In both cases interesting microstructures and near theoretical packing densities are obtained. However bulk superconductivity is degraded but restored with some interesting changes on reannealing. The tetragonal and orthorhombic Tl2Ba2CuO6 phases were successfully shock-synthesized in the time domain of microseconds at 100kbar. The products obtained ranged in phase purity from 85 to nearly 100%. The shock-synthesized tetragonal phase is a bulk superconductor with Tc (zero) of 55K. High resolution electron microscopy shows double copper layer defects in the shock synthesized tetragonal Tl2Ba2CuO6. The importance of shock induced defects and microstructures in the magnetic flux pinning mechanisms are briefly discussed.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering