Crystallographically oriented superconducting Bi2Sr2CaCu2O8by shock compaction of prealigned powder

摘要

Highly textured specimens of Bi2Sr2CaCu2O8were obtained by shock compaction of powder at 30ndash;140 kbar and by sintering. The compacts were characterized by xhyphen;ray diffraction, magnetic susceptibility, electrical resistance, optical microscopy, and scanning electron microscopy data. Preferential orientation with theahyphen;bplane in the plane of the diskhyphen;shaped compacts was achieved by tapping platelethyphen;shaped powder with a controlled size distribution, followed by shock compaction or by sintering. The shocked compacts were annealed to induce metallic resistance while maintaining preferential crystallographic orientation. The electrical and magnetic data demonstrate that shock compaction heterogeneously heats and bonds grain boundaries.