...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Crystal growth & design >Buffer Pellets for High-Yield, Top-Seeded Melt Growth of Large Grain Y-Ba-Cu-O Superconductors
【24h】

Buffer Pellets for High-Yield, Top-Seeded Melt Growth of Large Grain Y-Ba-Cu-O Superconductors

机译：大颗粒Y-Ba-Cu-O超导体高产量，种子高熔点融化生长的缓冲粒

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

Single-grain, (RE)-Ba-Cu-O [(RE)BCO)] bulk high-temperature superconductors have significant potential for application as trapped field magnets in a range of engineering devices. However, it is not trivial to fabricate single grains of (RE)BCO due to the complexity of the growth process, especially when the sample diameter exceeds 25 mm. In particular, difficulties associated with the seed crystal can lead to poor grain growth or to complete growth failure. We have employed an optimized buffer technique, which was determined by optimizing targeted critical parameters of the buffer pellet, including the choice of the buffer pellet composition and its aspect ratio, for the reliable fabrication of large, single grains of (RE)BCO. Potential candidates for the buffer pellet composition have been identified to yield successful grain growth and good superconducting properties. The optimum aspect ratio of the buffer pellet was also determined as part of this study. The optimized buffer pellet capped with the seed crystal has been demonstrated to work effectively as an efficient seed crystal and to aid significantly the growth of the Y-123 phase. We show that this optimized buffer technique ameliorates problems associated with both interfacial stress (commonly occurring at the seed/sample interface) and problems of grain contamination. We have fabricated a 40.8 mm diameter single-grain bulk superconductor and more than 25 single-grain YBCO samples with diameters in the range 25-35 mm by a significantly improved top-seeded melt growth process.
机译：单晶（RE）-Ba-Cu-O [（RE）BCO）块状高温超导体具有潜力，可作为一系列工程设备中的俘获场磁体。但是，由于生长过程的复杂性，尤其是当样品直径超过25 mm时，制造（RE）BCO的单颗粒并非易事。特别是，与种晶有关的困难会导致晶粒生长不良或完全生长失败。我们采用了一种优化的缓冲技术，该技术通过优化缓冲颗粒的目标关键参数（包括缓冲颗粒组成及其纵横比的选择）来确定，以便可靠地制造大的单粒（RE）BCO。已经确定了缓冲丸粒组合物的潜在候选物可以产生成功的晶粒生长和良好的超导性能。作为这项研究的一部分，还确定了缓冲颗粒的最佳长宽比。已经证明，用晶种覆盖的优化缓冲颗粒可以有效地用作有效的晶种，并显着帮助Y-123相的生长。我们表明，这种优化的缓冲技术可改善与界面应力（通常在种子/样品界面处发生）和谷物污染相关的问题。通过显着改善的顶晶熔体生长工艺，我们已经制造出了直径为40.8 mm的单晶散装超导体和25个以上的直径为25-35 mm的YBCO单晶。

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