Hydrogen-induced structural changes on NiAl(110)

Aubrey Hanbicki; H. L. Davis; A. P. Baddorf; D. B. Poker; E. W. Plummer

doi:10.1016/0039-6028(96)00851-5

Hydrogen-induced structural changes on NiAl(110)

Aubrey Hanbicki, H. L. Davis, A. P. Baddorf, D. B. Poker, E. W. Plummer

Scanning Tunneling Microscopy Group

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

Abstract

LEED I-V analysis and surface X-ray scattering measurements have been used to determine the structural changes induced by the adsorption of atomic hydrogen on NiAl(110) at 130 K. The clean surface, ordered with 50at% Ni-50at%Al, relaxes away from bulk truncation to exhibit a large ripple. At 130 K the rippling (Al out, Ni in) is 0.19 Å, as determined by LEED I-V. The adsorption of atomic hydrogen reduces this rippling by 16% at half of saturation coverage and at full saturation by 44%. Saturation coverage was measured to be one hydrogen atom per (1×1) surface unit cell (1 monolayer) using nuclear reaction analysis. This observation contradicts first principles calculations that predict 1 monolayer of H removes the surface rippling.

Original language	English
Pages (from-to)	L639-L646
Journal	Surface Science
Volume	365
Issue number	1
DOIs	https://doi.org/10.1016/0039-6028(96)00851-5
State	Published - Sep 10 1996

Funding

We would like to thank David Zehner for making these experiments possible. Oak Ridge National Laboratory is managed by Lockheed Martin Energy Research Corp. for the US Department of Energy under contract number DE-AC05-96OR22464.

Funders	Funder number
Lockheed Martin Energy Research Corp.
U.S. Department of Energy	DE-AC05-96OR22464

Keywords

Alloys
Atom-solid interactions
Hydrogen
Low energy electron diffraction (LEED)
NiAl
Surface relaxation and reconstruction
X-ray scattering, diffraction, and reflection

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10.1016/0039-6028(96)00851-5

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abstract = "LEED I-V analysis and surface X-ray scattering measurements have been used to determine the structural changes induced by the adsorption of atomic hydrogen on NiAl(110) at 130 K. The clean surface, ordered with 50at% Ni-50at%Al, relaxes away from bulk truncation to exhibit a large ripple. At 130 K the rippling (Al out, Ni in) is 0.19 {\AA}, as determined by LEED I-V. The adsorption of atomic hydrogen reduces this rippling by 16% at half of saturation coverage and at full saturation by 44%. Saturation coverage was measured to be one hydrogen atom per (1×1) surface unit cell (1 monolayer) using nuclear reaction analysis. This observation contradicts first principles calculations that predict 1 monolayer of H removes the surface rippling.",

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AU - Davis, H. L.

AU - Baddorf, A. P.

AU - Poker, D. B.

AU - Plummer, E. W.

PY - 1996/9/10

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N2 - LEED I-V analysis and surface X-ray scattering measurements have been used to determine the structural changes induced by the adsorption of atomic hydrogen on NiAl(110) at 130 K. The clean surface, ordered with 50at% Ni-50at%Al, relaxes away from bulk truncation to exhibit a large ripple. At 130 K the rippling (Al out, Ni in) is 0.19 Å, as determined by LEED I-V. The adsorption of atomic hydrogen reduces this rippling by 16% at half of saturation coverage and at full saturation by 44%. Saturation coverage was measured to be one hydrogen atom per (1×1) surface unit cell (1 monolayer) using nuclear reaction analysis. This observation contradicts first principles calculations that predict 1 monolayer of H removes the surface rippling.

AB - LEED I-V analysis and surface X-ray scattering measurements have been used to determine the structural changes induced by the adsorption of atomic hydrogen on NiAl(110) at 130 K. The clean surface, ordered with 50at% Ni-50at%Al, relaxes away from bulk truncation to exhibit a large ripple. At 130 K the rippling (Al out, Ni in) is 0.19 Å, as determined by LEED I-V. The adsorption of atomic hydrogen reduces this rippling by 16% at half of saturation coverage and at full saturation by 44%. Saturation coverage was measured to be one hydrogen atom per (1×1) surface unit cell (1 monolayer) using nuclear reaction analysis. This observation contradicts first principles calculations that predict 1 monolayer of H removes the surface rippling.

KW - Alloys

KW - Atom-solid interactions

KW - Hydrogen

KW - Low energy electron diffraction (LEED)

KW - NiAl

KW - Surface relaxation and reconstruction

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Hydrogen-induced structural changes on NiAl(110)

Abstract

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Keywords

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