Surface diffusion of chemisorbed oxygen on polycrystalline tungsten. II. diffusion of strongly bound oxygen

Journal Article · Wed Oct 01 00:00:00 EDT 1986 · Kinet. Catal. (Engl. Transl.); (United States)

OSTI ID:6909522

Kislyuk, M U; Savkin, V V

Using the split thermal desorption method, we have studied the diffusion of strongly bound oxygen (desorption activation energy about 450 kJ/mole) along the surface of polycrystalline tungsten. In the interval 1100-1470/sup 0/K, the temperature dependence of the diffusion coefficient is described by an Arrhenius equation with parameters D/sub 0/ = 3.10/sup -3/-5.10/sup -2/ cm/sup 2//sec, E = 110 +- 15 kJ/mole. We have investigated the dependence of the diffusion coefficient on surface concentration of oxygen at 1230/sup 0/K and have shown that it has a maximum at theta = 0.3-0.4 and a minimum at theta approx. = 0.8.

• Research Organization: Institute of Chemical Physics, Acad. of Sci., Moscow
• OSTI ID: 6909522
• Journal Information: Kinet. Catal. (Engl. Transl.); (United States), Vol. 27:2, PT. 2
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
OXYGEN
CHEMISORPTION
DESORPTION
DIFFUSION
TUNGSTEN
CATALYTIC EFFECTS
ACTIVATION ENERGY
ARRHENIUS EQUATION
CHEMICAL BONDS
QUANTITY RATIO
TEMPERATURE DEPENDENCE
TEMPERATURE EFFECTS
VERY HIGH TEMPERATURE
CHEMICAL REACTIONS
ELEMENTS
ENERGY
EQUATIONS
METALS
NONMETALS
SEPARATION PROCESSES
SORPTION
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties