Bi-Pb-Sr-Ca-Cu-O (BPSCCO) oxide superconductors are very attractive material as a highly sensitive magnetic sensor by using BPSCCO calcined powder. And it is found that the magnetic sensitivity increases as the value of critical current density (J(c)) increases. Researches for applications of high-T-c BPSCCO particles have been made to overcome the weak-link problem around the grain boundaries for higher J(c). Shock compaction for BPSCCO particles have been investigated to obtain higher J(c) by shock compaction technique. From x-ray diffraction (XRD)-analysis, it is found that the (BiPb)(2)Sr2Ca2Cu3Ox (Bi-2223) phase appeared after the shock compaction process under 3.79 GPa and annealed at 850 degrees C for 48 h with the (BiPb)(2)Sr2Ca1Cu2Ox (Bi-2212) phase. From atomic force microscope (AFM) image of the surface for BPSCCO specimens after shock compaction and annealed at 850 degrees C for 48 h, it is found from the section analysis that the surface of the specimens for shocked BPSCCO particles has large grains of 8-10 mu m in length partly with large growth-steps caused mainly by heats generated in shock compaction and annealing processes. The AM, difference of susceptibility at 5 K obtained from the temperature dependency of field cooling and zero field cooling at 20 Oe, which is proportional to J(c), is measured by the SQUID magnetometer. As a result, it is found from the susceptibility measurements as a function of temperatures that AM clearly increases to 0.025 (emu/g) for shocked BPSCCO particles after annealing at 850 degrees C for 48 h, which seems to indicate the new pinning centers around the grain boundaries caused probably by the new defects of vacancies. (c) 2005 American Vacuum Society.