Size effect on deuterium behavior in nano-sized vanadium layers
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Size effect on thermodynamics and diffusion of deuterium in nano-sized vanadium (V) layers is studied. Critical temperature (Tc) for deuterium phase transition is found to decrease with the inverse thickness of V layers and the thermodynamic factor increases as V thickness decreases. These effects are related to the deuterium-deuterium (D-D) interaction change versus V thickness, which experimentally proves that the D-D interaction plays the main contribution to the previously observed V size effect on deuterium chemical diffusion coefficients (Dc). The self-diffusion coefficients (Ds) are obtained through correcting Dc with the thermodynamic factors. It is found that the Ds are similar in 14 and 28 monolayers of V while slightly larger Ds are observed at high concentrations in 14 atomic layers. The weak site blocking effect in the interface is argued to be the main contribution to the observed size effect on Ds.
Ensize effect D-D interaction deuterium diffusion Fe/V superlattice optical transmission
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