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Atomic-scale chemical analyses of niobium oxide/niobium interfaces via atom-probe tomography
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10.1063/1.2987483
/content/aip/journal/apl/93/13/10.1063/1.2987483
http://aip.metastore.ingenta.com/content/aip/journal/apl/93/13/10.1063/1.2987483
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

3D reconstruction of a Nb specimen analyzed by LEAP tomography employing laser pulsing. The rectangular parallelepiped contains atoms in a volume. Niobium atoms are colored in pink and O atoms in sky blue.

Image of FIG. 2.
FIG. 2.

Steady-state voltage vs number of ions (depth) analysis profile showing a voltage drop at the surface niobium oxide/Nb interface, which explains the mushroom shape of the atomic reconstruction displayed in Fig. 1.

Image of FIG. 3.
FIG. 3.

(a) Atomic reconstruction of surface metal oxide layer on bulk Nb. The overall reconstruction dimensions are and the volume contains million atoms. The surface niobium oxide/Nb interface is identified with a O isoconcentration surface. (b) The surface niobium oxide/Nb interface identified with a O isoconcentration surface. The rms chemical roughness of the interface is 0.4 nm.

Image of FIG. 4.
FIG. 4.

Proxigram showing quantitative Nb and O concentration profiles corresponding to the atomic reconstruction displayed in Fig. 3. The profiles yield a thickness of the surface niobium oxide of 15 nm, with a constant surface Nb oxide composition corresponding to .

Image of FIG. 5.
FIG. 5.

The O/Nb ratio from the reconstruction of an oxidized Nb specimen plotted as a function of distance from the Nb oxide/Nb interface at zero. The stoichiometry of the surface Nb oxide is deduced from this profile, which indicates that it is close to .

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/content/aip/journal/apl/93/13/10.1063/1.2987483
2008-10-02
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Atomic-scale chemical analyses of niobium oxide/niobium interfaces via atom-probe tomography
http://aip.metastore.ingenta.com/content/aip/journal/apl/93/13/10.1063/1.2987483
10.1063/1.2987483
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