Structural transformations at the surface of the decagonal quasicrystal<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Al</mml:mi></mml:mrow><mml:mrow><mml:mn>70</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Co</mml:mi></mml:mrow><mml:mrow><mml:mn>15</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ni</mml:mi></mml:mrow

Zurkirch, M.; Bolliger, B.; Erbudak, M.; Kortan, A. R.

doi:10.1103/physrevb.58.14113

Cited by 42 publications

(24 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Strong epitaxial relationships exist between the icosahedral bulk and the decagonal overlayer. The decagonal XPD pattern resembles the XPD [33] and secondary electron imaging (SEI) [34] patterns taken from d-Al-Ni-Co. Note that the SEI pattern of the decagonal metastable Al 22 Pd 56 Mn 22 overlayer resembles the sputtered d-Al-Ni-Co surface [19].…”

Section: -1mentioning

confidence: 76%

Formation of a Stable Decagonal Quasicrystalline Al-Pd-Mn Surface Layer

et al. 2001

View full text Add to dashboard Cite

We report the in situ formation of an ordered equilibrium decagonal Al-Pd-Mn quasicrystal overlayer on the 5-fold symmetric surface of an icosahedral Al-Pd-Mn monograin. The decagonal structure of the epilayer is evidenced by x-ray photoelectron diffraction, low-energy electron diffraction and electron backscatter diffraction. This overlayer is also characterized by a reduced density of states near the Fermi edge as expected for quasicrystals. This is the first time that a millimetersize surface of the stable decagonal Al-Pd-Mn is obtained, studied and compared to its icosahedral counterpart.

show abstract

Section: -1mentioning

confidence: 76%

Formation of a Stable Decagonal Quasicrystalline Al-Pd-Mn Surface Layer

et al. 2001

View full text Add to dashboard Cite

show abstract

“…Rouxel et al pointed out that sputtering in UHV moves the surface composition toward the region of a CsCl phase in the Al-Cu-Fe phase diagram. 19 Zurkirch, Erbudak, and Kortan observed a cubic phase induced by Ar ϩ sputtering on decagonal Al-Ni-Co. 21 In a similar vein, Naumovic reported that Al depletion induced by high-temperature annealing could produce a CsCl-type structure on the fivefold surface of i-Al-Pd-Mn. 18,22 These findings are all qualitatively similar to results generated within scientific communities outside of surface science.…”

Section: Introductionmentioning

confidence: 87%

“…[15][16][17][18] Similar observations-Al depletion upon Ar ϩ sputtering-have been reported also on two other Al-rich alloys, i-Al-Cu-Fe, ͑Refs. 19 and 20͒ and decagonal Al-Ni-Co. 21 In the bulk phase diagrams, the Al-based icosahedral alloys often have a CsCl-type structure on the Al-poor side. Rouxel et al pointed out that sputtering in UHV moves the surface composition toward the region of a CsCl phase in the Al-Cu-Fe phase diagram.…”

Section: Introductionmentioning

confidence: 99%

Crystalline surface structures induced by ion sputtering of Al-rich icosahedral quasicrystals

et al. 1998

View full text Add to dashboard Cite

Low-energy electron diffraction patterns, produced from quasicrystal surfaces by ion sputtering and annealing to temperatures below ∼700 K, can be assigned to various terminations of the cubic CsCl structure. The assignments are based upon ratios of spot spacings, estimates of surface lattice constants, bulk phase diagrams vs surface compositions, and comparisons with previous work. The CsCl overlayers are deeper than about five atomic layers, because they obscure the diffraction spots from the underlying quasicrystalline substrate. These patterns transform irreversibly to quasicrystalline(like) patterns upon annealing to higher temperatures, indicating that the cubic overlayers are metastable. Based upon the data for three chemically identical, but symmetrically inequivalent surfaces, a model is developed for the relation between the cubic overlayers and the quasicrystalline substrate. The model is based upon the related symmetries of cubic close-packed and icosahedral-packed materials. The model explains not only the symmetries of the cubic surface terminations, but also the number and orientation of domains. Keywords Ames Laboratory, Materials Science and Engineering, Physics and Astronomy Disciplines Biological and Chemical Physics | Materials Science and Engineering | Physical Chemistry CommentsThis article is from Physical Review B 58, no. 15 (1998) Low-energy electron diffraction patterns, produced from quasicrystal surfaces by ion sputtering and annealing to temperatures below ϳ700 K, can be assigned to various terminations of the cubic CsCl structure. The assignments are based upon ratios of spot spacings, estimates of surface lattice constants, bulk phase diagrams vs surface compositions, and comparisons with previous work. The CsCl overlayers are deeper than about five atomic layers, because they obscure the diffraction spots from the underlying quasicrystalline substrate. These patterns transform irreversibly to quasicrystalline͑like͒ patterns upon annealing to higher temperatures, indicating that the cubic overlayers are metastable. Based upon the data for three chemically identical, but symmetrically inequivalent surfaces, a model is developed for the relation between the cubic overlayers and the quasicrystalline substrate. The model is based upon the related symmetries of cubic close-packed and icosahedral-packed materials. The model explains not only the symmetries of the cubic surface terminations, but also the number and orientation of domains. ͓S0163-1829͑98͒00239-2͔

show abstract

“…Secondary-electron imaging was used to study the decagonal surface of d-Al 70 Co 15 Ni 15 (Zurkirch, Bolliger, Erbudak, Kortan, 1998). It was shown that the Al depletion caused by 1.5-keV Ar þ -ion bombardment leads to a phase transformation into a disordered B2-phase.…”

Section: Surface Studies Of Decagonal Phasesmentioning

confidence: 99%

Twenty years of structure research on quasicrystals. Part I. Pentagonal, octagonal, decagonal and dodecagonal quasicrystals

Steurer¹

2004

Zeitschrift Für Kristallographie - Crystalline Materials

244

102

View full text Add to dashboard Cite

Is quasicrystal structure analysis a never-ending story? Why is still not a single quasicrystal structure known with the same precision and reliability as structures of regular periodic crystals? What is the state-of-the-art of structure analysis of axial quasicrystals? The present comprehensive review summarizes the results of almost twenty years of structure analysis of axial quasicrystals and tries to answer these questions as far as possible. More than 2000 references have been screened for the most reliable structural models of pentagonal, octagonal, decagonal and dodecagonal quasicrystals. These models, mainly based on diffraction data and/or on bulk and surface microscopic images are critically discussed together with the limits and potentialities of the respective methods employed.

show abstract

Structural transformations at the surface of the decagonal quasicrystalAl70Co15Ni

Cited by 42 publications

References 20 publications

Formation of a Stable Decagonal Quasicrystalline Al-Pd-Mn Surface Layer

Formation of a Stable Decagonal Quasicrystalline Al-Pd-Mn Surface Layer

Crystalline surface structures induced by ion sputtering of Al-rich icosahedral quasicrystals

Twenty years of structure research on quasicrystals. Part I. Pentagonal, octagonal, decagonal and dodecagonal quasicrystals

Contact Info

Product

Resources

About