Identification of an incommensurate FeAl2 overlayer on FeAl(1 1 0) using x-ray diffraction and reflectivity

A. P. Baddorf, S. S. Chandavarkar

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

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 languageEnglish
Pages (from-to)141-144
Number of pages4
JournalPhysica B: Physics of Condensed Matter
Volume221
Issue number1-4
DOIs
StatePublished - 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.

Fingerprint

Dive into the research topics of 'Identification of an incommensurate FeAl2 overlayer on FeAl(1 1 0) using x-ray diffraction and reflectivity'. Together they form a unique fingerprint.

Cite this