UNSPECIFIED (2005) Compositional and structural changes in i-AlPdMn quasicrystals induced by sputtering and annealing: A medium energy ion scattering study. Surface Science, 583 (2-3). pp. 139-150. doi:10.1016/j.susc.2005.03.049 ISSN 0039-6028.

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Abstract

The five-fold surface of an Al70Pd21Mn9 quasicrystal has been studied under a variety of surface preparation conditions using medium energy ion scattering. Argon ion sputtering of the surface was seen to give rise to Mn depletion and the formation of a thick five-domain AlPd(110) layer with 100 azimuths oriented close to, out not exactly on the five-fold symmetric directions of the substrate. Annealing to just 450 degrees C was sufficient to restore the Mn content and the icosahedral structure in the surface and near-surface region. Annealing to increasingly higher temperatures was seen to cause Mn enrichment in the surface region above the ideal composition for icosahedral structure and this was accompanied by increased amounts of disorder in the sample. For the highest temperature anneals the surface showed low apparent roughness and exhibited blocking patterns consistent with a contraction of the outermost layer of atoms in line with previous studies of this material. (c) 2005 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry Q Science > QC Physics
Journal or Publication Title:	Surface Science
Publisher:	ELSEVIER SCIENCE BV
ISSN:	0039-6028
Official Date:	1 June 2005
Dates:	Date Event 1 June 2005 UNSPECIFIED
Volume:	583
Number:	2-3
Number of Pages:	12
Page Range:	pp. 139-150
DOI:	10.1016/j.susc.2005.03.049
Publication Status:	Published

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