scholarly journals Comment on “Correlation between Dynamic Heterogeneity and Medium-Range Order in Two-Dimensional Glass-Forming Liquids”

2008 ◽  
Vol 100 (9) ◽  
Author(s):  
François Sausset ◽  
Gilles Tarjus
Keyword(s):  
Range Order ◽  
Two Dimensional ◽  
Dynamic Heterogeneity ◽  
Medium Range Order ◽  
Glass Forming ◽  
Medium Range

2 D 31P Exchange NMR: A new Approach for a Direct Probing of the Connectivities of Qn Units in Glasses

1995 ◽  
Vol 50 (2-3) ◽  
pp. 169-176 ◽  
Author(s):  
R. Born ◽  
M. Feike ◽  
C. Jäger ◽  
H. W. Spiess
Keyword(s):  
2D Nmr ◽  
Theoretical Description ◽  
Polarization Transfer ◽  
Range Order ◽  
Two Dimensional ◽  
New Approach ◽  
Medium Range Order ◽  
Magnesium Pyrophosphate ◽  
Medium Range

Abstract Recently, 31P two-dimensional (2D) NMR has been proposed as a powerful tool for direct investigations of the connectivities between the Qn units in glasses, i.e. the medium-range order. In this paper, the principles of these experiments and applications to both polycrystalline Mg2P2O7 and a Na2O-P205 glass are demonstrated, including a theoretical description and modelling of the polarization transfer between the two inequivalent phosphorus sites in the magnesium pyrophosphate.

scholarly journals Critical scaling of icosahedral medium-range order in CuZr metallic glass-forming liquids

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Z. W. Wu ◽  
F. X. Li ◽  
C. W. Huo ◽  
M. Z. Li ◽  
W. H. Wang ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Range Order ◽  
Critical Scaling ◽  
Medium Range Order ◽  
Glass Forming ◽  
Medium Range

Medium-range Order of Zr54Cu38Al8 Bulk Metallic Glass

2014 ◽  
Vol 1649 ◽  
Author(s):  
Pei Zhang ◽  
M. F. Besser ◽  
M. J. Kramer ◽  
P. M. Voyles
Keyword(s):  
Electron Microscopy ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Glass Forming Ability ◽  
Range Order ◽  
Thermally Stable ◽  
Cast State ◽  
Medium Range Order ◽  
Glass Forming ◽  
Medium Range

ABSTRACTWe have previously reported, based on fluctuation electron microscopy (FEM) data, that Zr50Cu45Al5 bulk metallic glass (BMG) contains significant icosahedral and crystal-like medium-range order. Here, we report similar finding for Zr54Cu38Al8 BMG, which is a poorer glass former. Like Zr50Cu45Al5, Zr54Cu38Al8 contains icosahedral and crystal-like structures. In the as-cast state, the crystal-like peak in the FEM data is stronger than icosahedral-like peak. After annealing at 0.83Tg (573 K), the icosahedral-like peak increases, but, unlike Zr50Cu45Al5, the crystal-like peak does not decrease. This tendency toward stronger, more thermally stable crystal-like order may be associated with the poorer glass forming ability of Zr54Cu38Al8.

scholarly journals Short and Medium-Range Order in Liquid Ternary Al80Co10Ni10, Al72.5Co14.5Ni13, and Al65Co17.5Ni17.5 Alloys

2010 ◽  
Vol 65 (1-2) ◽  
pp. 123-131 ◽  
Author(s):  
Oleksandr S. Roik ◽  
Oleksiy Samsonnikov ◽  
Volodymyr Kazimirov ◽  
Volodymyr Sokolskii
Keyword(s):  
Three Dimensional ◽  
Range Order ◽  
Ternary Alloys ◽  
X Ray Diffraction ◽  
Medium Range Order ◽  
Intermediate Range Order ◽  
Transition Metal Atoms ◽  
Medium Range ◽  
Three Dimensional Models ◽  
Co Alloys

AbstractA local short-to-intermediate range order of liquid Al80Co10Ni10, Al72.5Co14.5Ni13, and Al65Co17.5Ni17.5 alloys was examined by X-ray diffraction and the reverse Monte Carlo modelling. The comprehensive analysis of three-dimensional models of the liquid ternary alloys was performed by means of the Voronoi-Delaunay method. The existence of a prepeak on the S(Q) function of the liquid alloys is caused by medium range ordering of 3d-transition metal atoms in dense-packed polytetrahedral clusters at temperatures close to the liquidus. The non-crystalline clusters, represented by aggregates of pentagons that consist of good tetrahedra, and chemical short-range order lead to the formation of the medium range order in the liquid binary Al-Ni, Al-Co and ternary Al-Ni-Co alloys.

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