Equilibrium diffusion processes between the bulk and the surface of (100) tantalum with participation of oxygen atoms

The oxygen atoms diffusion exchange between the bulk and surface of the (100) tantalum at the earliest stages of the oxygen absorption is accomplished through the high-temperature auger spectroscopy method with recording directly from the sample, heated up to 2500 deg C. The thin tantalum sheets 1 x 0.05 x 40 mm3 were used as samples. The difference in the potential barriers for the diffusion into and out from the volume is determined, and it is shown that the above are of the equilibrium character within the temperature range of 1000-2000 K; the active thermodesorption begins at higher temperatures