...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Superconductor Science & Technology >On the role of precursor powder composition in controlling microstructure, flux pinning, and the critical current density of Ag/Bi2Sr2CaCu2Ox conductors
【24h】

On the role of precursor powder composition in controlling microstructure, flux pinning, and the critical current density of Ag/Bi2Sr2CaCu2Ox conductors

机译：前体粉末组合物在控制微观结构，磁通钉钉和临界电流密度的作用

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

Precursor powder composition is known to strongly affect the critical current density (J(c)) of Ag/Bi2Sr2CaCu2Ox (Bi-2212) wires. However, reasons for such J(c) dependence have not yet been fully understood, compromising our ability to achieve further optimization. We systematically examined superconducting properties, microstructural evolution and phase transformation, and grain boundaries of Bi-2212 conductors fabricated from precursor powders with a range of compositions using a combination of transport-current measurements, a quench technique to freeze microstructures at high temperatures during heat treatment, and scanning transmission electron microscopy (STEM). Samples include both dip-coated tapes and round wires, among which a commercial round wire carries a high J(c) of 7600 A mm(-2) at 4.2 K, self-field and 2600 A mm(-2) at 4.2 K, 20 T, respectively. In the melt, this high-J(c) conductor, made using a composition of Bi2.17Sr1.94Ca0.89Cu2Ox, contains a uniform dispersion of fine alkaline-earth cuprate (AEC) and copper-free solid phases, whereas several low-J(c) conductors contain large AEC particles. Such significant differences in the phase morphologies in the melt are accompanied by a drastic difference in the formation kinetics of Bi-2212 during recrystallization cooling. STEM studies show that Bi-2212 grain colonies in the high-J(c) conductors have a high density of Bi2Sr2CuOy (Bi-2201) intergrowths, whereas a low-J(c) conductor, made using Bi2.14Sr1.66Ca1.24Cu1.96Ox, is nearly free of them. STEM investigation shows grain boundaries in low-J(c) conductors are often insulated with a Bi-rich amorphous phase. High-J(c) conductors also show higher flux-pinning strength, which we ascribe to their higher. Bi-2201 intergrowth density.
机译：已知前体粉末组合物强烈影响AG / BI2SR2CAC2OX（BI-2212）线的临界电流密度（J（C））。然而，尚未完全理解此类J（c）依赖性的原因，损害了我们实现进一步优化的能力。我们系统地检查了由一系列组合物制成的二染料性能，微结构演化和相变，以及使用传输电流测量的组合，淬火技术在热处理期间冻结微观结构的淬火技术和扫描透射电子显微镜（茎）。样品包括浸涂带和圆线，其中商业圆线在4.2k，自场和2600amm（-2）的高j（c）为7600amm（-2），在4.2k分别为20吨。在熔体中，使用Bi2.17sR1.94ca0.89cu2ox的组合物制成的该高j（c）导体含有均匀分散的细碱土铜（AEC）和无铜固相，而几个低J（c）导体含有大的AEC颗粒。熔体中相形形态的这种显着差异伴随着重结晶冷却期间Bi-2212的形成动力学中的剧烈差异。词干研究表明，高j（c）导体中的Bi-2212谷物菌落具有高密度的Bi2sr2cuoy（Bi-2201）栖生殖，而使用Bi2.14SR1.66CA1.24CU1制造的低J（C）导体。 .96x，几乎没有他们。干调查显示低J（C）导体中的晶界通常与双富含双非晶相的绝缘。高J（C）导体还显示出更高的磁通循环强度，我们归因于更高的循环强度。 Bi-2201晶间密度。

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