The Static and Dynamic Lattice Changes Induced by Hydrogen Adsorption on NiAl(110)

Details The Static and Dynamic Lattice Changes Induced by Hydrogen Adsorption on NiAl(110) The Static and Dynamic Lattice Changes Induced by Hydrogen Adsorption on NiAl(110)

2002-05-29

arxiv.org/abs/cond-mat/0205623v1

A.T. Hanbicki, P.J. Rous, and E.W. Plummer, Phys. Rev. B 67, 205405 (2003)

Physics

Condensed Matter

Materials Science

36 pages, including 12 figures, 2 tables and 58 references

Scientific paper

10.1103/PhysRevB.67.205405

Static and dynamic changes induced by adsorption of atomic hydrogen on the NiAl(110) lattice at 130 K have been examined as a function of adsorbate coverage. Adsorbed hydrogen exists in three distinct phases. At low coverages the hydrogen is itinerant because of quantum tunneling between sites and exhibits no observable vibrational modes. Between 0.4 ML and 0.6 ML, substrate mediated interactions produce an ordered superstructure with c(2x2) symmetry, and at higher coverages, hydrogen exists as a disordered lattice gas. This picture of how hydrogen interacts with NiAl(110) is developed from our data and compared to current theoretical predictions.

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