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通过对在不同外磁场下Ｂｉ１．９Ｐｂ０．３Ｓｒ２．０Ｃａ１．７Ｍｇ０．３Ｃｕ３．１Ｏｘ超导块材的交流磁化率的测量，获得了样品内晶粒间和晶粒内对外场的不问响应范围．通过与粉状样品实验结果的比较和Ｘ光分析，认为块状样品在温度为１００Ｋ左右出现的抗磁台阶是样品内晶粒间超导弱连接的一种抗磁效应．对弱连接区有效钉扎力Ｆｐ和临界电流密度Ｊｃ与外场Ｈ的关系进行了讨论．
By measuring the AC susceptibility of Bi1.9Pb0.3Sr2.0Ca1.7Mg0.3Cu3.1Ox superconducting blocks under different external magnetic fields, the response range of the intergranular and intragranular to external fields in the sample was obtained. By comparison with the experimental results of powdered samples and X-ray analysis, it is considered that the anti-magnetic steps appearing at a temperature of about 100K in a bulk sample are a kind of diamagnetic effect of the weak inter-crystal grains in the sample. The relationship between the effective pinning force Fp and the critical current density Jc in the weak junction and the field H was discussed.