Identification of an incommensurate FeAl{sub 2} overlayer on FeAl(110) using x-ray diffraction and reflectivity
- Oak Ridge National Lab., TN (United States)
- Tennessee Univ., Knoxville, TN (United States). Dept. of Physics and Astronomy
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.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 204114
- Report Number(s):
- CONF-9506314-3; ON: DE96005740; TRN: 96:008603
- Resource Relation:
- Conference: 4. international conference on surface x-ray and neutron scattering, Lake Geneva, WI (United States), 25-30 Jun 1995; Other Information: PBD: 30 Jun 1995
- Country of Publication:
- United States
- Language:
- English
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