Abstract
Secondary ion mass spectrometry (SIMS) analysis is used to investigate the composition of surface monolayers of the hydride forming intermetallic TiFe alloy during its interaction with oxygen. Oxygen, which is chemisorbed on the surface, is shown to form strong chemical bonds with both alloy components. As a result, on the surface and in the subsurface region of the alloy, a joint oxide structure forms with a certain stoichiometric ratio between titanium, iron and oxygen. With an increasing partial pressure of oxygen in the oxide structure being formed, the ratio of the number of oxygen atoms to the number of matrix atoms increases. This process occurs uniformly without any abrupt phase transformations.
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