The structure of an Al Mn-type Al (Mn,Pd) crystal 3 3 studied by single-crystal X-ray diffraction analysis

Matsuo, Yoshie; Kaneko, M.; Yamanoi, T.; Kaji, N.; Sugiyama, Kazumasa; Hiraga, Kenji

doi:10.1080/095008397178968

Cited by 18 publications

(5 citation statements)

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“…With a unique exception, all the structures are orthorhombic or monoclinic with the β angle approaching pentagonal ≈108°. Most of the structures with 4 and higher layer periodicity satisfy all requirements for complex alloys including various approximants of the orders 1/1 1/1, 2/1 1/1 and 3/2 2/1 [142][143][144][145], while certain representatives contain over 500 [146] or even 1000 (Al 474 Cr 108 , Al 477. 44 Cr 63.42 Fe 51.42 [31,145,147]) atoms per unit cell moving towards the level of complexity of a quasicrystal.…”

Section: D Quasiperiodic Structuresmentioning

confidence: 99%

Metallic alloys at the edge of complexity: structural aspects, chemical bonding and physical properties*

Ovchinnikov

Smetana

Mudring

2020

J. Phys.: Condens. Matter

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Complex metallic alloys belong to the vast family of intermetallic compounds and are hallmarked by extremely large unit cells and, in many cases, extensive crystallographic disorder. Early studies of complex intermetallics were focusing on the elucidation of their crystal structures and classification of the underlying building principles. More recently, ab initio computational analysis and detailed examination of the physical properties have become feasible and opened new perspectives for these materials. The present review paper provides a summary of the literature data on the reported compositions with exceptional structural complexity and their properties, and highlights the factors leading to the emergence of their crystal structures and the methods of characterization and systematization of these compounds.

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Section: D Quasiperiodic Structuresmentioning

confidence: 99%

Metallic alloys at the edge of complexity: structural aspects, chemical bonding and physical properties*

Ovchinnikov

Smetana

Mudring

2020

J. Phys.: Condens. Matter

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“…(Hiraga, Sun, 1993b) using structure information from the approximant Al 3 Mn (Hiraga, Kaneko, Matsuo, Hashimoto, 1993) and the structure of d-Al-Mn (Steurer, 1991). The edge length of the underlying rhomb Penrose Tiling is 2.516 A, of the pentagonal subunits 4.785 A and of the large decagon, star, hexagon tiles 6.587 A (distances refer to the lattice parameters of Al 74.7 Mn 20.9 Pd 4.4 ; Matsuo, Kaneko, Yamanoi, Kaji, Sugiyama, Hiraga, 1997). The grey shaded regions mark two neighbouring pentagonal atomic columns considered as characteristic structural elements.…”

Section: Almnpd-wy98mentioning

confidence: 99%

“…Structure models of these approximants were presented by Li, Li, Frey, Steurer, Kuo (1995). The structure of the ( 1 = 1 , 1 = 1 )-approximant Al 74.7 Mn 20.9 Pd 4.4 was determined by single-crystal X-ray diffraction and a model for the unit tiles of the d-phase proposed (AlMnPd-MKYKSH-97; Matsuo, Kaneko, Yamanoi, Kaji, Sugiyama, Hiraga, 1997). This model is based on AlMnPd-HS-93 and contains Pd atom positions taken from the approximant structure.…”

Section: Approximantsmentioning

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

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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.

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“…In particular, the crystal structure of Al3Mn with a pentagonal columnar structure serves an essential idea for the structure of decagonal quasicrystal with a period of about 12 Å [3-6]. Magnetic properties for quasicrystals were extensively studied in a variety of Al-Mn based quasicrystals and Mn-Mn interactions were counted as one of the possible origins for their properties [7][8][9][10].…”

Section: Discussionmentioning

confidence: 99%

Crystal structure of aluminum germanium manganese (72.0:26.3:57.7), Al72.0Ge26.3Mn57.7

Sugiyama¹,

Sato²,

Yokoyama³

et al. 2007

Zeitschrift Für Kristallographie - New Crystal Structures

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Al72.0Ge26.3Mn57.7, orthorhombic, Pnma (no. 62), a = 14.516(2) Å, b = 12.484(2) Å, c = 12.405(2) Å, V = 2248.0 Å 3 , Z = 1, Rgt(F) = 0.036, wRref(F 2 ) = 0.108, T = 297 K. Source of materialA needle-like crystal was picked up from a master ingot with nominal composition of Al40Mn35Ge25, which was prepared by arc-melting the mixture of pure Al, Mn and Ge in an argon atmosphere. The chemical composition of the title compound Al46.1Mn37.0Ge16.9 was determined by the electron probe microanalysis. Another crystalline phase, Al 34.5 Mn 33.7 Ge 31.8 , which is frequently discussed as a magnetic ternary AlMnGe alloy [1], was also appeared in the present sample. DiscussionSince the discovery of quasicrystals in rapidly solidified Al-rich manganese alloys [1,2], the so-called approximant structures have been used for providing structural models of quasicrystals. In particular, the crystal structure of Al3Mn with a pentagonal columnar structure serves an essential idea for the structure of decagonal quasicrystal with a period of about 12 Å [3-6]. Magnetic properties for quasicrystals were extensively studied in a variety of Al-Mn based quasicrystals and Mn-Mn interactions were counted as one of the possible origins for their properties [7][8][9][10]. Since an Al3Mn-type approximant for the Al-Mn-Ge decagonal quasicrystal also indicated a large magnetization anisotropy [9], we carried out the structural analysis of the Al3Mn-type approximant in this ternary alloy system. The diffraction patterns of the title compound are quite similar to those of the typical Al3Mn phase including the systematic absences of k + l = 2n for the 0kl plane and h = 2n + 1 for the hk0 plane [3][4][5][6]. These results readily lead the space group of Pnma or Pn2 1 a. The converged parameters in the non-centrosymmetric Pn21a model serve no significant differences from those in the Pnma model, and present analysis selects the centrosymmetric space group Pnma. It is usually difficult to determine the distribution of three elements by using the diffraction data alone. Nevertheless, we can obtain here one of the most feasible distribution models as follows. The electron density distribution and corresponding first nearest neighbor distances indicate that Mn1, Mn2, Mn3, Mn4, Mn/Al5, Mn/Al6 and Mn7 are almost fully occupied by Mn. The highest electron density was observed at Ge/Al25 and Ge is suggested to reside here. Mn/Al8, Mn9, Mn/Al15 and Mn/Al16 are coordinated by Ge/Al25 with distances from 2.51 Å to 2.58 Å, suggesting the preference of the smallest Mn at these sites, again. The fundamental preference of Al at remaining thirteen sites was revealed and interatomic distances among them lie over 2.66 Å, except for d(Al/Ge18Al/Ge18) = 2.276(3) Å. Taking into account such features, the structure of the title compound was refined starting from the structural model of Al3Mn with chemically disordered eleven Mn/Al sites and fourteen Al/Ge sites. Several least-squares iterations revealed the chemically ordered sites of Mn1, Mn2, Mn3, Mn4, Mn7, Mn9, ...

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The structure of an Al Mn-type Al (Mn,Pd) crystal 3 3 studied by single-crystal X-ray diffraction analysis

Cited by 18 publications

References 0 publications

Metallic alloys at the edge of complexity: structural aspects, chemical bonding and physical properties*

Metallic alloys at the edge of complexity: structural aspects, chemical bonding and physical properties*

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

Crystal structure of aluminum germanium manganese (72.0:26.3:57.7), Al72.0Ge26.3Mn57.7

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