Abstract
Surface composition and chemistry of binary hydrogen storage compounds are studied by means of magnetic susceptibility measurements. FeTi and Fe0.85Mn0.15Ti decompose at the surface forming superparamagnetic Fe particles which dominate the magnetism of powders. The surface decomposition, e.g., as a consequence of a number of hydrogenation cycles, results in an increase and the oxidation of the Fe particles, e.g., by impurities, results in a decrease of the magnetization. In this way the surface composition may be monitored. We found that FeTi is more susceptible to posioning by impurities than (FeMn)Ti because of a smaller segregation rate.
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