Nb和Nb3Sn涂层SRF级Nb中天然氧化层的选择性热演化：一项原位角分辨XPS研究
Selective thermal evolution of native oxide layer in Nb and Nb3Sn-coated SRF grade Nb: An in-situ angular XPS study
AI总结：
本文通过原位角分辨XPS和掠入射XRD研究Nb3Sn与纯Nb天然氧化层的热演化，揭示Sn降低邻近Nb反应活性导致两者氧化行为差异，为Nb3Sn基SRF腔加工提供指导。
摘要：
本文讨论了对Nb3Sn和纯Nb上天然氧化层热演化进行的原位角分辨XPS研究结果。XPS数据使用常规谱仪采集，在最高600°C的光谱采集中使用AlK(α) X射线源，在600°C以上温度使用MgK(α) X射线源。该氧化层的厚度、成分和热稳定性对理解粒子加速器中使用的超导射频（SRF）腔的功能特性具有重要意义。目前已有共识认为氧化物在表面电阻（Rs）中发挥作用。本研究的重点是Nb3Sn，这是一种用于制造超导射频（SRF）腔以及量子传感的有前景的材料；同时纳入纯Nb用于比较。研究发现这两种材料中氧化层的热演化存在显著差异，这归因于Sn原子对Nb3Sn薄膜中Nb原子反应活性的影响。该金属间化合物固体中的Nb和Sn原子具有不同的电负性，Sn原子可以降低固体中邻近Nb原子周围的电子密度，从而降低它们对氧的反应活性。这一点体现在Nb3Sn上形成的氧化层的厚度、成分和热稳定性中。XPS光谱还辅以利用ESRF同步辐射装置采集的掠入射XRD图谱。本文讨论的结果揭示了Nb3Sn化合物中氧化物的演化规律，并为其在加速器和其他超导器件中Nb3Sn基SRF腔的潜在应用提供了加工指导。
英文摘要：
This contribution discusses the results of an in-situ angular XPS study on the thermal evolution of the native oxide layer on Nb3Sn and pure Nb. XPS data were recorded with conventional spectrometers using an AlK(alpha) X-ray source for spectra collected up to 600 C, and an MgK(Alpha) X-rays source for temperatures above 600 C. The effect of the thickness, composition, and thermal stability of that oxide layer is relevant to understanding the functional properties of superconducting radiofrequency (SRF) cavities used in particle accelerators. There is a consensus that oxide plays a role in surface resistance (Rs). The focus of this study is Nb3Sn, which is a promising material that is used in the manufacturing of superconducting radiofrequency (SRF) cavities as well as in quantum sensing, and pure Nb, which was included in the study for comparison. The thermal evolution of the oxide layer in these two materials is found to be quite different, which is ascribed to the influence of the Sn atom on the reactivity of the Nb atom in Nb3Sn films. Nb and Sn atoms in this intermetallic solid have different electronegativity, and the Sn atom can reduce electron density around neighbouring Nb atoms in the solid, thus reducing their reactivity for oxygen. This is shown in the thickness, composition, and thermal stability of the oxide layer formed on Nb3Sn. The XPS spectra were complemented by grazing incident XRD patterns collected using the ESRF synchrotron radiation facility. The results discussed herein shed light on oxide evolution in the Nb3Sn compound and guide its processing for potential applications of the Nb3Sn-based SRF cavities in accelerators and other superconducting devices.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
