...
  • 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 >Atom-probe tomography analyses of niobium superconducting RF cavity materials
【24h】

Atom-probe tomography analyses of niobium superconducting RF cavity materials

机译：铌超导射频腔材料的原子探针层析成像分析

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

We present the first atom-probe tomographic (APT) measurements of niobium superconducting RF (SCRF) cavity materials. APT involves the atom-by-atom dissection of sharply pointed niobium tips, along with their niobium oxide coatings, via the application of a high-pulsed electric field and the measurement of each ion's mass-to-charge state ratio (m) with time-of-flight (TOF) mass spectrometry. The resulting atomic reconstructions, typically containing at least 10(5) atoms and with typical dimensions of 10(5) nm(3) (or less), show the detailed, nanoscale chemistry of the niobium oxide coatings, and of the underlying high-purity niobium metal. Our initial results show a nanochemically smooth transition through the oxide layer from near-stoichiometric Nb2O5 at the surface to near-stoichiometric Nb2O as the underlying metal is approached (after similar to 10 nm of surface oxide). The underlying metal, in the near-oxide region, contains a significant amount of interstitially dissolved oxygen (similar to 5-10 at.%), as well as a considerable amount of dissolved hydrogen. The experimental results are interpreted in light of current models of oxide and sub-oxide formation in the Nb-O system. (c) 2006 Elsevier B.V. All rights reserved.
机译：我们介绍了铌超导RF（SCRF）腔材料的首次原子探针层析成像（APT）测量。 APT涉及通过施加高脉冲电场并测量每个离子的质荷比（m / n），对尖锐的铌尖端及其铌氧化物涂层进行逐原子解剖飞行时间（TOF）质谱所得的原子重构物通常包含至少10（5）个原子，并且典型尺寸为10（5）nm（3）（或更小），显示出铌氧化物涂层及其下层的高浓度纳米颗粒的详细的纳米级化学结构。纯度的铌金属。我们的初步结果显示，随着接近底层金属（接近10 nm表面氧化物），纳米氧化物从表面的近化学计量Nb2O5到表面的近化学计量Nb2O进行了纳米化学平滑过渡。底层金属在接近氧化物的区域中包含大量的间隙溶解氧（约5-10 at。％）以及大量的溶解氢。根据当前Nb-O系统中氧化物和亚氧化物形成的模型来解释实验结果。 （c）2006 Elsevier B.V.保留所有权利。

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