Abstract
In this work we evaluated oxygen dissolution parameters using a mathematical treatment of the profiles and positions of the niobium diffraction lines obtained after oxidation of single crystals of niobium in the temperature range 300–400 °C and at an oxygen pressure of 75 Torr. The oxygen concentration c s at the metal-oxide interface and the oxygen diffusion coefficient D were determined as functions of the temperature and crystallographic orientation of the specimens. Then values of the weight gain obtained from thermogravimetric measurements (oxygen dissolution plus oxide scale formation) were compared with those corresponding to oxygen dissolution, calculated from the limiting concentration and the diffusion coefficient. A deformation of the body-centred solid solution into a tetragonal lattice is assumed. This assumption gives better agreement with the results and also provides an explanation of the reactive anisotropy observed from ellipsometry and microgravimetry experiments and from the mathematical treatment of the niobium diffraction lines.
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