scholarly journals The binary aluminum scandium clusters AlxScy with x + y = 13: when is the icosahedron retained?

RSC Advances ◽  
2021 ◽  
Vol 11 (63) ◽  
pp. 40072-40084
Author(s):  
Ngo Tuan Cuong ◽  
Nguyen Thi Mai ◽  
Nguyen Thanh Tung ◽  
Ngo Thi Lan ◽  
Long Van Duong ◽  
...  
Keyword(s):  
Icosahedral Structure

The icosahedral structure of the AlxScy clusters with x + y = 13.

Microtwinning Evidence For The Apparent Five-Fold Symmetry in T2(Al6Li3Cu)

1987 ◽  
Vol 45 ◽  
pp. 24-25
Author(s):  
Kenneth S. Vecchio ◽  
David B. Williams
Keyword(s):  
Stable Equilibrium ◽  
Equilibrium Phase ◽  
Convergent Beam Electron Diffraction ◽  
Icosahedral Structure ◽  
Cubic Crystals ◽  
Icosahedral Phases ◽  
Heat Treated ◽  
Zero Layer ◽  
Convergent Beam ◽  
Zr Alloy

Since the discovery in 1984 by Shechtman et al. of crystals which display apparent five-fold symmetry, extensive effort has been given to establishing a theoretical basis for the existence of icosahedral phases (eg.2.). Several other investigations have been centered on explaining these observations based on twinning of cubic crystals (eg.3.). Recently, the existence of a stable, equilibrium phase T2Al6 Li3Cu) possessing an icosahedral structure has been reported in the Al-Li-Cu system(4-6).In the present study an Al-2.6wt.%Li-l.5wt.%Cu-0.lwt.%Zr alloy was heat treated at 300°C for 100hrs. to produce large T2 precipitates. Convergent Beam Electron Diffraction (CBED) patterns were obtained from two-fold, three-fold, and apparent five-fold axes of T2 particles. Figure 1 shows the five-fold symmetric zero layer CBED pattern obtained from T2 particles.

Icosahedral structure in hydrogenated cobalt and nickel clusters

1991 ◽  
Vol 95 (12) ◽  
pp. 8919-8930 ◽  
Author(s):  
T. D. Klots ◽  
B. J. Winter ◽  
E. K. Parks ◽  
S. J. Riley
Keyword(s):  
Icosahedral Structure ◽  
Nickel Clusters ◽  
Cobalt And Nickel

Observation of virus-like particles in thin sections of the plumose anemone, Metridium senile

2001 ◽  
Vol 81 (5) ◽  
pp. 879-880 ◽  
Author(s):  
William H. Wilson ◽  
David M. Chapman
Keyword(s):  
West Coast ◽  
Sea Anemone ◽  
Dense Core ◽  
Icosahedral Structure ◽  
The West ◽  
Thin Sections ◽  
Virus Like Particles ◽  
Metridium Senile ◽  
Electron Dense Core

Virus-like particles (VLPs) were observed in thin sections of the plumose anemone, Metridium senile, collected from seawater off the west coast of Sweden in 1969. The VLPs were observed in the nucleus of spiroblasts and amoebocytes; they were either pentagonal or hexagonal in section, indicating an icosahedral structure. Virus-like particles were ∼60 nm in diameter, with an electron-dense core 40 nm in width; they had no apparent tail. This is the first substantial report of viruses observed in sea anemone cells.

Formation of an Icosahedral Structure during Crystallization of Copper Nanoclusters

Copper ◽  
2007 ◽  
pp. 260-266
Author(s):  
S. L. Gafner ◽  
J. J. Gafner ◽  
S. V. Kosterin
Keyword(s):  
Icosahedral Structure ◽  
Copper Nanoclusters

Kinetics of the amorphous to icosahedral structure transition in Al-Cu-V and Al-Mn-Si alloys

1989 ◽  
Vol 37 (5) ◽  
pp. 1443-1449 ◽  
Author(s):  
A.P. Tsai ◽  
A. Inoue ◽  
Y. Bizen ◽  
T. Masumoto
Keyword(s):  
Icosahedral Structure ◽  
Structure Transition ◽  
Kinetics Of

Computer Simulation of the Formation Process of Cu-Au Nanoparticles by Condensation

2020 ◽  
Vol 310 ◽  
pp. 96-100
Author(s):  
Yuri Ya Gafner ◽  
Svetlana L. Gafner ◽  
Andrey V. Nomoev
Keyword(s):  
Computer Simulation ◽  
Gas Phase ◽  
Au Nanoparticles ◽  
Simulation Method ◽  
Chemical Compositions ◽  
Icosahedral Structure ◽  
External View ◽  
Number Of Clusters ◽  
Large Size ◽  
Binary Nanoparticles

The computer simulation method was used to examine condensation of 90124 Cu and Au atoms from the gas phase. To analyze the synthesis processes, there were selected chemical compositions Cu3Au, Cu-Au, Cu90Au10 and Cu60Au40 being cooled with liquid nitrogen during the condensation. The undertaken simulation showed that the increase in the percentage of gold atoms in the initial couple decreases the number of clusters of a relatively large size. Moreover, the analysis of the external view and the structure of Cu-Au nanoparticles of various chemical composition allowed us to conclude that a large number of binary nanoparticles were of an icosahedral structure.

Quasicrystalline phase formation in Al62Cu22.5Fe12.5 and Al55Cu22.5Fe12.5Be7 alloys

2001 ◽  
Vol 16 (6) ◽  
pp. 1535-1540 ◽  
Author(s):  
S. M. Lee ◽  
B. H. Kim ◽  
D. H. Kim ◽  
W. T. Kim
Keyword(s):  
Heat Treatment ◽  
Icosahedral Phase ◽  
Partial Replacement ◽  
Quasicrystalline Phase ◽  
Icosahedral Structure ◽  
High Quality ◽  
Icosahedral Quasicrystalline Phase ◽  
Face Centered ◽  
Icosahedral Quasicrystalline ◽  
Conventionally Cast

Formation of the icosahedral quasicrystalline phase in conventionally cast Al62Cu25.5Fe12.5 and Al55Cu25.5Fe12.5Be7 alloys were investigated. The icosahedral phase (I-phase) forming ability was greatly improved by partial replacement of Al by 7 at.% Be. The as-cast Al55Cu25.5Fe12.5Be7 alloy consisted of dendritic primary I-phase and interdendritic τ-phase, whereas that of an as-cast Al62Cu25.5Fe12.5 alloy consisted of various phases such as the β-, I-, and τ-phases, together with a small amount of the λ- and η-phases. The kinetic barrier for transformation into single I-phase by heat treatment was greatly reduced in an Al55Cu25.5Fe12.5Be7 alloy. The I-phase in an Al55Cu25.5Fe12.5Be7 alloy has the same face centered icosahedral structure as that in an Al62Cu25.5Fe12.5 alloy and is of high quality without phason strain.

Zwölfgliedrige Heteroborancluster durch Copyrolyse von Tetrachlordiboran(4) mit Elementhalogeniden/ Twelve-Vertex Heteroborane Clusters by Copyrolysis of Tetrachlorodiborane(4) and Element Halides

1997 ◽  
Vol 52 (2) ◽  
pp. 221-226 ◽  
Author(s):  
Wolfgang Einholz ◽  
Ronald Schäfer ◽  
Willi Keller ◽  
Bernhard Vogler
Keyword(s):  
Nmr Spectroscopy ◽  
Icosahedral Structure ◽  
Cosy Nmr

Abstract The perchlorinated arsaboranes closo-1,2-As2B10Cl10 and As4B8C16 are formed in the co­ pyrolysis of B2C14 and AsCl3 at temperatures of 330-450°C. The icosahedral structure of closo-1,2-As2B10Cl10 is confirmed by 11B-11B-COSY-NMR spectroscopy. As4B8Cl6 is suppo­ sed to be a conjuncto-borane (As2B4Cl3)2 with two boron-boron linked As2B4Cl3 octahedra. The copyrolysis of B2Cl4 andSbCl3 or SbCl5 yields Sb2B10Cl10, and the corresponding reaction of B2Cl4 with S2Cl2 gives the icosahedral thiaborane cluster SB11Cl11 .

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