X-ray investigation of subsurface interstitial oxygen at Nb/oxide interfaces

作者：Delheusy M^*; Stierle A; Kasper N; Kurta R P; Vlad A; Dosch H; Antoine C; Resta A; Lundgren E; Andersen J

来源：Applied Physics Letters, 2008, 92(10): 101911.

DOI：10.1063/1.2889474

We have investigated the dissolution of a natural oxide layer on a Nb(110) surface upon heating, combining x-ray reflectivity, grazing incidence diffuse scattering, and core-level spectroscopy. The natural oxide reduces after heating to 145 degrees C partially from Nb(2)O(5) to NbO(2), and an enrichment in subsurface interstitial oxygen by similar to 70% in a depth of 100 A is observed. After heating to 300 degrees C, the oxide reduces to NbO and the surplus subsurface oxygen gets dissolved into the bulk. Our approach can be applied for further investigation of the effect of subsurface interstitial oxygen on the performance of niobium rf cavities.

• 出版日期2008-3-10
• 单位中国科学院金属研究所