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Title: Effect of atomic ordering on hydrogen dissociation on Ni₃Fe surfaces
Authors: Cheng, XY
Chung, YW
Zhao, B
Hong, B
Liu, CT
Issue Date: 16-Mar-2009
Source: Applied physics letters, 16 Mar. 2009, v. 94, no. 11, 111902, p. 1-3
Abstract: The dissociation of molecular to atomic hydrogen on clean surfaces of Ni₃Fe with either an ordered or disordered structure has been directly investigated by thermal desorption studies. Results show that when exposed to an ordered Ni₃Fe surface, molecular hydrogen dissociates to produce atomic hydrogen, which desorbs from the surface around 350 K. On the other hand, hydrogen does not dissociate on a disordered Ni₃Fe surface. These results indicate that atomic ordering has a marked effect on surface chemical reactivity. Furthermore, our study provides a mechanistic basis to explain the hydrogen-induced embrittlement in ordered Ni₃Fe but not in disordered Ni₃Fe.
Keywords: Desorption
Dissociation
Hydrogen
Iron alloys
Nickel alloys
Surface chemistry
Publisher: American Institute of Physics
Journal: Applied physics letters 
ISSN: 0003-6951
EISSN: 1077-3118
DOI: 10.1063/1.3089575
Rights: © 2009 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in X.Y. Cheng et al., Appl. Phys. Lett. 94, 111902 (2009) and may be found at http://apl.aip.org/resource/1/applab/v94/i11/p111902_s1.
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