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X-ray investigation of subsurface interstitial oxygen at Nb/oxide interfaces
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10.1063/1.2889474
/content/aip/journal/apl/92/10/10.1063/1.2889474
http://aip.metastore.ingenta.com/content/aip/journal/apl/92/10/10.1063/1.2889474
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Left: Schematic view of the surface of a niobium single crystal oxidized under ambient conditions, its natural layered oxide, and subsurface interstitial oxygen. For comparison, the penetration depth of the rf field is shown. Right: Niobium lattice distortions in the local neighborhood of interstitial oxygen on octahedral sites (Ref. 12).

Image of FIG. 2.
FIG. 2.

(a) X-ray reflectivity data (open circles) with fits (solid lines) from a Nb(110) single crystal oxidized for in air at RT, after heating at (, UHV) and (, UHV). Dashed curve: Best fit of the data without oxide layer, which cannot describe the data. (b) Electron density profiles along the surface normal obtained from the fits (see text for details). (c) Core-level Nb spectra (open circles) with fits (solid lines) measured on Nb(110) oxidized for in air at RT, after (, UHV) and (, UHV) (photon energy of , normal emission angle). In (a) and (c), the scans are offset in the direction.

Image of FIG. 3.
FIG. 3.

(a) Reciprocal space map of the Nb(110) plane: the circles locate the interstitial oxygen-induced diffuse scattering at and equivalent positions. (b) Grazing incidence diffuse scattering measured after RT ambient pressure oxidation along the direction (open squares: polarization corrected data). The main components of the fit (solid line) are plotted: calculated diffuse peaks around and (red curves); , (800), and (12 00) peaks (dashed curves). (c) Temperature dependence of the grazing incidence diffuse scattering (open squares) and fits (solid lines), after oxidation for in air at RT, after heating at (, UHV) and at (, UHV). (d) Temperature evolution of the interstitial oxygen-induced diffuse intensity around .

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/content/aip/journal/apl/92/10/10.1063/1.2889474
2008-03-11
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: X-ray investigation of subsurface interstitial oxygen at Nb/oxide interfaces
http://aip.metastore.ingenta.com/content/aip/journal/apl/92/10/10.1063/1.2889474
10.1063/1.2889474
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