Crystal Growth of Large Icosahedral Zn-Mg-Y Single Grains by a Liquid Encapsulated Top Seeded Solution Growth Method

Langsdorf, A.; Aßmus, W.

doi:10.1002/(sici)1521-4079(199902)34:2<261::aid-crat261>3.0.co;2-5

Cited by 18 publications

(6 citation statements)

References 4 publications

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“…In icosahedral Mg 29 Y 9 Zn 62 (sample by Langsdorf, Assmus, 1999) one of the interests was to determine the number of detectable Bragg peaks for an optimised data collection with an standard diffractometer. By matching a Z-module onto an undistorted layer in reciprocal space (Fig.…”

Section: Icosahedral Phasessupporting

confidence: 91%

Towards the real structure of quasicrystals and approximants by analysing diffuse scattering and deconvolving the Patterson

Estermann¹,

Lemster²,

Haibach³

et al. 2000

Zeitschrift Für Kristallographie - Crystalline Materials

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Methods based on X-ray area detectors are presented for acquiring and analysing single-crystal X-ray diffraction data from quasicrystals and approximants. These methods are complementary to high-resolution diffractometry and fully exploit the possibilities of modern two-dimensional X-ray detector systems (imaging plates and charge coupled devices) such as the on-line read-out capability and the possibility to collect large volumes of reciprocal space in a quantitative and rapid way. In contrast to a classical point detector, area detectors allow the measurement of a very large number of Bragg reflections in a reasonable time scale, as is shown with a large unitcell periodic approximant in the Al± ±Co± ±Ni alloy system. For large approximants exhibiting strong pseudosymmetry, direct methods for structure solution usually fail. Recently implemented Patterson deconvolution techniques are shown to succeed. The extension of techniques for area detectors ± ± beyond the standard application of collecting integrated Bragg intensities ± ± to the quantitative acquisition of continuous and diffuse scattering data is presented with particular emphasis on quasicrystals. One of the key techniques is the quantitative reconstruction of undistorted layers and volumes in reciprocal space. This is crucial for developing and comparing possible models for structural disorder in quasicrystals. Examples for decagonal Al± ±Co± ±Ni and icosahedral Al± ±Mn± ±Pd are given in respect to possibilities and limitations of X-ray area detectors.

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Section: Icosahedral Phasessupporting

confidence: 91%

Towards the real structure of quasicrystals and approximants by analysing diffuse scattering and deconvolving the Patterson

Estermann¹,

Lemster²,

Haibach³

et al. 2000

Zeitschrift Für Kristallographie - Crystalline Materials

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“…The single-grain Zn 2 Mg crystals investigated were grown by the liquid-encapsulated top-seeded solution growth technique [7]. The quality of the crystals was checked by Laue photography.…”

Section: Methodscontrasting

confidence: 45%

The Mg 2pcore-level in Zn₂Mg

Karpus¹

2007

Lithuanian J. Phys.

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We present a synchrotron radiation photoemission (PE) spectroscopy study of the Mg 2p shallow core-level in Zn2Mg Laves phase. The PE measurements were performed on in situ cleaved single-grain samples at 10 −10 mbar pressure and low, 90−100 K, temperature. Analysis of Mg 2p PE spectra indicates the surface shift of the core-level of −0.12 eV. Parameters of the bulk component of Mg 2p level, the binding energy of 49.98 eV, the spin-orbit splitting ∆s−o = 0.28 eV, and the lifetime broadening γ = 0.06 eV, are comparable to their values determined previously for pure crystalline Mg.

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“…fci-Ho-M g-Zn single crystals were grown from the melt by the liquid-encapsulated topseeded solution growth method (LETSSG) according to Langsdorf et al 43 100g of the pure elements (Zn 99.9999%, M g 99.99% and Ho 99.9%) were put into an aluminia crucible in a molar ratio n(Ho) : n(M g) : n(Zn) = 3.0 : 50.5 : 46.5 . To prevent the metals (in particular zinc) from evaporating during crystal growth, 20g of an eutectic KCl/LiCl mixture was added that forms the liquid encapsulation.…”

Section: Phase Preparationmentioning

confidence: 99%

Medium range real atomic structure of face-centred icosahedral Ho₉Mg₂₆Zn₆₅

Brühne¹,

Sterzel²,

Uhrig³

et al. 2004

Zeitschrift Für Kristallographie - Crystalline Materials

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A new approach to solve quasicrystalline atomic structures in 3-dimensional (3D) real space is presented: The atomic pair distribution function (PDF) of face centred icosahedral Ho 9 Mg 26 Zn 65 [a(6D) = 2×5.18(3)Å] was obtained from in-house X-ray diffraction data (MoKα 1 ). Starting with rational approximant models, derived from 1/1and 2/1-Al-Mg-Zn, its local and medium range structure was refined (r < 27Å; R = 12.9%) using the PDF data. 85% of all atoms show Frank-Kasper (FK) type coordinations. Basic structural unit is the 3-shell, 104-atom Bergman cluster (d ≈ 15Å) comprising a void at its center. The clusters are interconnected sharing common edges and hexagonal faces of the 3rd shells. T he remaining space is filled by some glue atoms (9% of all atoms), yielding an almost tetrahedrally close packed structure. All Ho atoms are surrounded by 16 neighbours (FK-polyhedron "P"). Most of them (89%) are situated in the 2nd shell (pentagon dodecahedron), the other act as glue atoms. As a result and as can be expected for real matter, local atomic coordinations in quasicrystals are similar compared to common crystalline intermetallic compounds. From our results, the long range quasiperiodic structure of icosahedral Mg-Zn-RE (RE = Y and some rare earths) is anticipated to be a canonical cell tiling (CCT , after Henely) decorated with Bergman clusters.

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Crystal Growth of Large Icosahedral Zn-Mg-Y Single Grains by a Liquid Encapsulated Top Seeded Solution Growth Method

Cited by 18 publications

References 4 publications

Towards the real structure of quasicrystals and approximants by analysing diffuse scattering and deconvolving the Patterson

Towards the real structure of quasicrystals and approximants by analysing diffuse scattering and deconvolving the Patterson

The Mg 2pcore-level in Zn₂Mg

Medium range real atomic structure of face-centred icosahedral Ho₉Mg₂₆Zn₆₅

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Crystal Growth of Large Icosahedral Zn-Mg-Y Single Grains by a Liquid Encapsulated Top Seeded Solution Growth Method

Cited by 18 publications

References 4 publications

Towards the real structure of quasicrystals and approximants by analysing diffuse scattering and deconvolving the Patterson

Towards the real structure of quasicrystals and approximants by analysing diffuse scattering and deconvolving the Patterson

The Mg 2pcore-level in Zn2Mg

Medium range real atomic structure of face-centred icosahedral Ho9Mg26Zn65

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The Mg 2pcore-level in Zn₂Mg

Medium range real atomic structure of face-centred icosahedral Ho₉Mg₂₆Zn₆₅