Tubes fabricated of polycrystalline YBa/sub 2/Cu/sub 3/O/sub 7-x/ are characterized, and details of the fabrication procedure are discussed. The microstructure of the tubes determined by scanning electron microscopy and X-ray diffractometry is described. Resistive measurements of T/sub c/ and Delta T/sub c/ have been made. The tubes have also been characterized by means of SQUID (superconducting quantum interference device) magnetometry. The temperature dependence of magnetic fields trapped axially in the tubes has been measured and estimates of penetration depth are given. Moreover, measurements of the transverse shielding effectiveness of the tubes have been made and are compared with theoretical predictions. Studies on flux penetration into the tubes are described. Findings from the microstructure studies are correlated with the observed superconductivity properties. The results on the high-temperature materials are compared to results obtained previously on tubes made from conventional superconductors.
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机译：表征了由多晶YBa / sub 2 / Cu / sub 3 / O / sub 7-x /制造的管，并讨论了制造过程的细节。描述了通过扫描电子显微镜和X射线衍射法测定的试管的微观结构。已经进行了T / sub c /和ΔT/ sub c /的电阻测量。还通过SQUID（超导量子干涉装置）磁力测定法对电子管进行了表征。测量了轴向滞留在管中的磁场的温度依赖性，并给出了穿透深度的估计值。此外，已经对管子的横向屏蔽效果进行了测量，并与理论预测进行了比较。描述了对焊剂渗透到管中的研究。微观结构研究的发现与观察到的超导性能相关。将高温材料的结果与先前在常规超导体制成的管上获得的结果进行比较。
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