清浄Nb表面への水素の吸着と偏析

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  • Adsorption and Segregation of Hydrogen on Clean Nb Surface

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Sticking coefficient of H2, α , on a clean Nb surface was measured as a function of specimen temperature (25 - 477 ?C) and hydrogen uptake. The initial value of sticking coefficient at negligible hydrogen uptake was ca. 0.25 and was independent of surface temperature. At any temperature examined, α showed a significant reduction with increase in hydrogen uptake, although the extent of reduction decreased with increasing temperature. Such reduction in α was ascribed to the increase in the surface coverage of hydrogen due to surface segregation and was explained by a model assuming equilibrium partitioning of hydrogen between the surface and the solid solution phase in the bulk.

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