标题： 考虑从磁测量中得到的临界电流密度的HTS颗粒尺寸分布 显示英文标题

标题： Accounting the size distribution of HTS granules for the critical current density from magnetic measurements

摘要： 从磁滞回线确定临界电流密度被广泛用于表征和比较超导样品。 带材和单晶的磁滞回线取决于临界电流密度和样品尺寸。 后者决定了超导电流循环的尺度。 然而，在通过固相合成或溶胶-凝胶法制备的多晶高温超导体中，磁化由单个晶粒中超导电流的循环决定。 本文讨论了晶粒尺寸分布对电流循环有效尺度的影响。 对数正态分布和威布尔分布都被认为是晶粒尺寸的可能分布。 计算晶内电流密度的有效尺寸已被证明明显大于平均晶粒尺寸。 显示英文摘要

摘要： The determination of the critical current density from magnetic hysteresis loops is widely used to characterize and compare superconducting samples. Magnetic hysteresis loops for tapes and single crystals depend on both the critical current density and sample size. The latter sets the scale of supercurrent circulation. However, in polycrystalline high-temperature superconductors prepared by solid-phase synthesis or by sol-gel method, the magnetization is determined by the circulation of supercurrents in individual grains. The paper discusses the effect of the grain size distribution on the effective scale of current circulation. Log-normal and Weibull distributions are both considered as possible for grain sizes. The effective size for calculating the intragrain current density has been shown to be significantly larger than the average grain size.