一、前言 从高温超导体的应用前景看,目前尚存在着一些突出的问题,其中之一是晶粒内传输临界电流密度太低.而晶粒间的传输临界电流密度更低,前者是由于这些材料晶粒内钉扎作用较弱;而后者则是由于在晶粒间界处存在结构无序和超导相干长度太短,由此,烧结工艺制得超 I. Introduction From the perspective of the application of high-temperature superconductors, there are still some outstanding problems, of which one is that the intracrystalline transmission critical current density is too low, while the intercrystalline transmission critical current density is lower, the former is due to these The intra-material pinning effect is weak; while the latter is due to the existence of structural disorder in the grain boundaries and the superconducting coherence length is too short, whereby the sintering process was super