Abstract
FeAl, like NiAl, crystallizes in the CsCl structure. Consequently, the bulk (110) planes contain equal amounts of Fe and Al distributed as interlocking rectangles. Unlike the NiAl(110) surface, which retains the (1 × 1) in-plane symmetry of the bulk, FeAl(110) reconstructs to form an ordered, incommensurate overlayer. The reconstructed layer is discerned from x-ray diffraction rods at half-order positions along the [110] direction, and displaced ±0.2905 from integer positions along the [001] direction. Peak widths reveal excellent long-range order. Specular reflectivity measurements above and below the Fe Ka edge can be reproduced using a model containing a single reconstructed overlayer with an Fe: Al ratio of 1:2, consistent with FeAl2.
Original language | English |
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Pages (from-to) | 141-144 |
Number of pages | 4 |
Journal | Physica B: Physics of Condensed Matter |
Volume | 221 |
Issue number | 1-4 |
DOIs | |
State | Published - Apr 2 1996 |
Funding
Special thanks to Gary Ownby and Harald Graupner for crystal preparation and valuable discussion. Research at ORNL was sponsored by the Division of Materials Sciences, U.S. Department of Energy under contract DE-AC05-84OR21400 with Lockheed Martin Energy Systems, Inc.