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通过临界电流密度的测定,透射电子显微镜和化学分析建立了临界电流密度 Jc 与Nb_3Sn 中氧含量以及存在的很细的弥散析出物间的关系。当氧含量从小于50PPm(重量)增加至1000PPm 时,在46仟高斯下的临界电流密度 Jc 从1×10~5安/厘米~2增加到6×10~5。对所有氧含量大于160PPm 的试样,观察到一种很细的析出物(质点尺寸～50埃)。结论是析出物在 Nb_3Sn 中起磁钉中心的作用。发现氮含量与临界电流密度间没有关系。
The relationship between the critical current density Jc and the oxygen content in Nb3Sn and the presence of fine dispersive precipitates was established by the determination of critical current density, transmission electron microscopy and chemical analysis. When the oxygen content increases from less than 50 ppm to 1000 ppm, the critical current density Jc at 46 gauss increases from 1 × 10 -5 A / cm 2 to 6 × 10 -5. For all samples with an oxygen content greater than 160 ppm, a very fine precipitate (particle size ~ 50 angstroms) was observed. The conclusion is that the precipitates act as the center of the magnet in Nb_3Sn. It was found that there was no relationship between the nitrogen content and the critical current density.