Study of preferential sputtering and segregation effects on the surface composition of Al-Pd-Mn quasi-crystals

TitleStudy of preferential sputtering and segregation effects on the surface composition of Al-Pd-Mn quasi-crystals
Publication TypeJournal Article
Year of Publication2008
AuthorsSamavat F, Gladys MJ, Jenks CJ, Lograsso TA, King BV, O'Connor DJ
Journal TitleSurface and Interface Analysis
Volume40
Pages433-435
Date PublishedMar-Apr
Type of ArticleArticle
ISBN Number0142-2421
Accession NumberISI:000255486200068
Keywordsal-pd-mn, alpdmn, ENERGY ION-SCATTERING, LEIS, preferential sputtering, segregation
Abstract

Using 2 keV He+ and Ne+ low-energy ion scattering (LEIS), it was found that the Al/Pd concentration ratio at the surface of a nominally Al69.9Pd20.5Mn9.6 quasi-crystal decreases to a steady-state value under bombardment as a result of preferential sputtering. Sputtering of an annealed surface results in a significant increase in Mn concentration on the surface which remained at annealing temperatures below 575 K. Variations of the Mn/Pd and Al/Pd ratios have been measured by LEIS as a function of temperature in the range 295-975 K for clean-annealed and sputtered surfaces. The results show that Al/Pd ratio does not significantly change from 295 to 575 K for both He+ and Ne+ but increases with sample temperatures up to 875 K. Copyright (C) 2008 John Wiley & Sons, Ltd.

DOI10.1002/sia.2769
Alternate JournalSurf. Interface Anal.