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Title: Surface structure of stepped NiAl(111) by low energy Li sup + ion scattering

Abstract

Previous LEED and ISS studies have indicated that there are equal amounts of Ni and Al terminated domains on the (111) surface of the strongly ordered NiAl alloy. However, a study of the energy dependent broadening of LEED beams diffracted from a stepped NiAl(111) surface indicates that there is a preference for double step heights suggesting that high step density may impose termination in only one type of domain. The authors have now measured the angle dependence of Li{sup +} scattering from stepped NiAl(111) surface cut 1.7 from the (111) orientation. Scattering along the (121) and (211) azimuths permit conditions where only the first layer or where a sum of first and second layer scattering is observed. By analysis of the Ni and Al intensities from first and second layer scattering is observed. By analysis of the Ni and Al intensities from first and second layers and comparison with previous ion scattering results on NiAl(110), it is found that the equilibrium stepped surface terminates with roughly equal amounts of both types of domains. The angle dependence of the ion scattering confirms the bulk terminated surface structure with first layer relaxation. The incidence angle associated with the onset of second layermore » scattering from Ni and Al can be used to determine the first inter-layer spacing for each type of domain independently. The measured spacings confirm previous LEED results for the low index surface that the first layer spacing differs in magnitude for the two different terminations.« less

Authors:
; ;  [1]
  1. Oak Ridge National Lab., TN (United States)
Publication Date:
OSTI Identifier:
7295064
Resource Type:
Journal Article
Journal Name:
Surface Science; (Netherlands)
Additional Journal Information:
Journal Volume: 236; Journal ID: ISSN 0039-6028
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM ALLOYS; CRYSTAL STRUCTURE; NICKEL ALLOYS; ANGULAR DISTRIBUTION; COMPARATIVE EVALUATIONS; ELECTRON DIFFRACTION; EXPERIMENTAL DATA; LITHIUM IONS; MILLER INDICES; SCATTERING; SURFACES; ALLOYS; CHARGED PARTICLES; COHERENT SCATTERING; DATA; DIFFRACTION; DISTRIBUTION; EVALUATION; INFORMATION; IONS; NUMERICAL DATA; 360102* - Metals & Alloys- Structure & Phase Studies

Citation Formats

Overbury, S H, Mullins, D R, and Wendelken, J F. Surface structure of stepped NiAl(111) by low energy Li sup + ion scattering. United States: N. p., 1990. Web. doi:10.1016/0039-6028(90)90766-2.
Overbury, S H, Mullins, D R, & Wendelken, J F. Surface structure of stepped NiAl(111) by low energy Li sup + ion scattering. United States. https://doi.org/10.1016/0039-6028(90)90766-2
Overbury, S H, Mullins, D R, and Wendelken, J F. 1990. "Surface structure of stepped NiAl(111) by low energy Li sup + ion scattering". United States. https://doi.org/10.1016/0039-6028(90)90766-2.
@article{osti_7295064,
title = {Surface structure of stepped NiAl(111) by low energy Li sup + ion scattering},
author = {Overbury, S H and Mullins, D R and Wendelken, J F},
abstractNote = {Previous LEED and ISS studies have indicated that there are equal amounts of Ni and Al terminated domains on the (111) surface of the strongly ordered NiAl alloy. However, a study of the energy dependent broadening of LEED beams diffracted from a stepped NiAl(111) surface indicates that there is a preference for double step heights suggesting that high step density may impose termination in only one type of domain. The authors have now measured the angle dependence of Li{sup +} scattering from stepped NiAl(111) surface cut 1.7 from the (111) orientation. Scattering along the (121) and (211) azimuths permit conditions where only the first layer or where a sum of first and second layer scattering is observed. By analysis of the Ni and Al intensities from first and second layer scattering is observed. By analysis of the Ni and Al intensities from first and second layers and comparison with previous ion scattering results on NiAl(110), it is found that the equilibrium stepped surface terminates with roughly equal amounts of both types of domains. The angle dependence of the ion scattering confirms the bulk terminated surface structure with first layer relaxation. The incidence angle associated with the onset of second layer scattering from Ni and Al can be used to determine the first inter-layer spacing for each type of domain independently. The measured spacings confirm previous LEED results for the low index surface that the first layer spacing differs in magnitude for the two different terminations.},
doi = {10.1016/0039-6028(90)90766-2},
url = {https://www.osti.gov/biblio/7295064}, journal = {Surface Science; (Netherlands)},
issn = {0039-6028},
number = ,
volume = 236,
place = {United States},
year = {1990},
month = {1}
}