Interaction of oxygen with the (110) face of a niobium single crystal
The low-energy electron diffraction (LEED) and contact potential difference (CPD) methods were used in vacuum better than 10/sup -10/ torr to investigate the structure of adsorbed oxygen and of the change in the work function of the (110) face of Nb in the temperature range 25--2000 degreeC. The reduction in the work function at the beginning of adsorption at room temperature was 0.6 eV and its maximum increase was 1.0 eV. No significant change in the work function was observed when oxygen was adsorbed on a crystal kept at a temperature in the range 500--2000 degreeC. The results obtained indicated that oxygen diffused to a considerable extent into the bulk of the crystal even at room temperature and this altered the structure of the (110) face of Nb; after heating, a single-crystal NbO film formed on this surface and its (111) face was oriented parallel to the substrate. When oxygen was adsorbed on a hot crystal, it was possible to obtain Nb/sup 0/ and NbO/sub 2/ films whose (110) and (100) faces were oriented parallel to the substrate surface. (AIP)
- Research Organization:
- Physicotechnical Institute, Sukhumi
- OSTI ID:
- 7355389
- Journal Information:
- Sov. Phys. - Solid State (Engl. Transl.); (United States), Journal Name: Sov. Phys. - Solid State (Engl. Transl.); (United States) Vol. 17:12; ISSN SPSSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360105* -- Metals & Alloys-- Corrosion & Erosion
ADSORPTION
CHEMICAL REACTIONS
COHERENT SCATTERING
CRYOGENIC FLUIDS
DIFFRACTION
ELECTRON DIFFRACTION
ELEMENTS
FLUIDS
HIGH TEMPERATURE
MEDIUM TEMPERATURE
METALS
NIOBIUM
NONMETALS
OXIDATION
OXYGEN
REFRACTORY METALS
SCATTERING
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TRANSITION ELEMENTS
VERY HIGH TEMPERATURE
WORK FUNCTIONS