Identification of an incommensurate FeAl{sub 2} overlayer on FeAl(110) using x-ray diffraction and reflectivity

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FeAl, like NiAl, crystallizes in the CsCl structure. Consequently the (110) planes contain equal amounts of Fe and Al distributed as interlocking rectangles. Unlike the NiAI(110) surface, which retains the (1{times}l) in-plane symmetry of the bulk, FeAl(l10) reconstructs to form an ordered, incommensurate overlayer. The reconstructed layer introduces x-ray diffraction rods at half-order positions along the [1{bar 1}0] direction, and displaced {plus_minus}0.2905 from integer positions along the [001] direction. Peak widths reveal excellent long range order. Specular reflectivity measurements above and below the Fe K{alpha} edge can be reproduced using a model containing a single reconstructed overlayer with an Fe:Al ... continued below

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12 p.

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Baddorf, A.P. & Chandavarkar, S.S. June 30, 1995.

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  • Baddorf, A.P. Oak Ridge National Lab., TN (United States)
  • Chandavarkar, S.S. Tennessee Univ., Knoxville, TN (United States). Dept. of Physics and Astronomy

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Description

FeAl, like NiAl, crystallizes in the CsCl structure. Consequently the (110) planes contain equal amounts of Fe and Al distributed as interlocking rectangles. Unlike the NiAI(110) surface, which retains the (1{times}l) in-plane symmetry of the bulk, FeAl(l10) reconstructs to form an ordered, incommensurate overlayer. The reconstructed layer introduces x-ray diffraction rods at half-order positions along the [1{bar 1}0] direction, and displaced {plus_minus}0.2905 from integer positions along the [001] direction. Peak widths reveal excellent long range order. Specular reflectivity measurements above and below the Fe K{alpha} edge can be reproduced using a model containing a single reconstructed overlayer with an Fe:Al ratio of 1:2, consistent with FeA{sub I}2.

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12 p.

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INIS; OSTI as DE96005740

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  • 4. international conference on surface x-ray and neutron scattering, Lake Geneva, WI (United States), 25-30 Jun 1995

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  • Other: DE96005740
  • Report No.: CONF-9506314--3
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 204114
  • Archival Resource Key: ark:/67531/metadc670523

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  • June 30, 1995

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  • June 29, 2015, 9:42 p.m.

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  • Jan. 19, 2016, 3:41 p.m.

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Baddorf, A.P. & Chandavarkar, S.S. Identification of an incommensurate FeAl{sub 2} overlayer on FeAl(110) using x-ray diffraction and reflectivity, article, June 30, 1995; Tennessee. (digital.library.unt.edu/ark:/67531/metadc670523/: accessed October 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.