纳米反应法制备超细低碳含量Bi-Pb-Sr-Ca-Cu-O超导体原始粉末

NANO-REACTION PROCESS TO SYNTHESIZE ULTRAFINE Bi-Pb-Sr-Ca-Cu-O SUPERCONDUCTOR PRECURSOR POWDER WITH LOW CARBON CONTENT

提出了一种适合制备高均匀性Bi-Pb-Sr-Ca-Cu-O超导体超细粉的新方法.先将金属离子混合溶液转变成纳米粒子悬浮液，使成分不均匀性限制在纳米尺度上，然后使悬浮液中的纳米粒子以尽可能小的团聚机会转变成合适相组成的氧化物超细粉末，从而实现超导体原始粉末的超细化.用该方法在短时间内合成了超细（约200nm）低碳含量（约200μg／g）的Bi-Pb-Sr-Ca-Cu-O超导体原始粉末.并可在较低温度较短时间内烧结成高Tc相超导体.

New process has been developed to synthesize ultrafine Bi-Pb-Sr-Ca-Cu-O superconductor precursor powder with high homogeneity. First, nanoparticle suspension is prepared from mixed cation solution, and thus the inhomogeneity is limitted in nanosize level.Second, nanoparticles are transformed into ultrafine oxide particles with suitable phase assemblages with agglomerate possibility minimized as possible as it can be, and thereby the ultrafine state of bismuth-based superconductor precursor powder with low carbon content (≈200 μg/g) is prepared in short time by this new process, which can sintered into high Tc superconductor at lower temperature.