...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Physica, C. Superconductivity and its applications >Flux mapping at 77 K and local measurement at lower temperature of thin-wall YBaCuO single-domain samples oxygenated under high pressure
【24h】

Flux mapping at 77 K and local measurement at lower temperature of thin-wall YBaCuO single-domain samples oxygenated under high pressure

机译：高压氧合的薄壁YBaCuO单畴样品在77 K处的通量映射和较低温度下的局部测量

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

YBCO single-domain samples are suitable for the production of high trapped fields in the range 20-77 K using a cryocooler or liquid nitrogen. But the oxygenation process required to actually transform the single domains into superconductors induces an extensive crack network that is limiting the material performances. Thin-wall geometry has been introduced to reduce the diffusion paths and to enable a progressive oxygenation strategy. As a consequence cracks are drastically reduced. In addition the use of a high oxygen pressure (16 MPa) speeds up further the process by displacing the oxygen - temperature equilibrium towards the higher temperature of the phase diagram. The advantage of thin-wall geometry is that such an annealing can be applied directly to a much larger sample. Remarkable results are obtained without any doping by the combination of thin walls and oxygen high pressure. While classical plain samples yield 300-400 mT, a trapped field of 840 mT has been measured at 77 K on a 16 mm diameter Y123 thin-wall single-domain sample with an annealing time as short as 3 days. Local measurements with a fixed Hall probe on top of the sample were performed at lower temperature after magnetization either in a static field or in a pulse field. The trapped field is significantly higher at lower temperature. Cryocoolers become the key to compromise between performances and cryogenic cost around 40 K.
机译：YBCO单畴样品适用于使用低温冷却器或液氮生产20-77 K范围内的高俘获场。但是实际上将单畴转变为超导体所需的充氧过程会引起广泛的裂纹网络，从而限制了材料性能。引入了薄壁几何形状以减少扩散路径并实现渐进的氧合策略。结果，裂缝大大减少了。此外，使用高氧气压力（16 MPa）可通过将氧气-温度平衡移向相图的较高温度来进一步加快该过程。薄壁几何形状的优点是可以将这种退火直接应用于更大的样品。通过薄壁和氧气高压的结合，无需掺杂即可获得显着结果。虽然经典的普通样品的产量为300-400 mT，但在直径为16 mm的Y123薄壁单畴样品上，在77 K时的俘获场为840 mT，退火时间短至3天。在静态磁场或脉冲磁场中磁化后，在较低温度下用固定的霍尔探头在样品顶部进行局部测量。在较低温度下，俘获场明显更高。低温冷却器成为在性能和约40 K的低温成本之间折衷的关键。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号