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 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.

The Structure of Ion-Implanted Amorphous Silicon

1998 ◽  
Vol 540 ◽  
Author(s):  
J. M. Gibson ◽  
J-Y. Cheng ◽  
P. Voyles ◽  
M.M.J. TREACY ◽  
D.C. Jacobson
Keyword(s):  
Amorphous Silicon ◽  
Network Model ◽  
Random Network ◽  
Amorphous Semiconductors ◽  
Range Order ◽  
Medium Range Order ◽  
Medium Range ◽  
Large Heat ◽  
Continuous Random Network ◽  
Ion Implanted

AbstractUsing fluctuation microscopy, we show that ion-implanted amorphous silicon has more medium-range order than is expected from the continuous random network model. From our previous work on evaporated and sputtered amorphous silicon, we conclude that the structure is paracrystalline, i.e. it possesses crystalline-like order which decays with distance from any point. The observation might pose an explanation for the large heat of relaxation that is evolved by ion-implanted amorphous semiconductors.

Atomic packing and short-to-medium-range order in metallic glasses

Nature ◽  
2006 ◽  
Vol 439 (7075) ◽  
pp. 419-425 ◽  
Author(s):  
H. W. Sheng ◽  
W. K. Luo ◽  
F. M. Alamgir ◽  
J. M. Bai ◽  
E. Ma
Keyword(s):  
Metallic Glasses ◽  
Range Order ◽  
Atomic Packing ◽  
Medium Range Order ◽  
Medium Range

Medium-Range Order of Amorphous Silicon Germanium Alloys: Small-Angle X-Ray Scattering Study

1989 ◽  
Vol 28 (Part 2, No. 7) ◽  
pp. L1092-L1095 ◽  
Author(s):  
Shin-ichi Muramatsu ◽  
Toshikazu Shimada ◽  
Hiroshi Kajiyama ◽  
Kazufumi Azuma ◽  
Takeshi Watanabe ◽  
...  
Keyword(s):  
Amorphous Silicon ◽  
Small Angle ◽  
Silicon Germanium ◽  
Range Order ◽  
Medium Range Order ◽  
X Ray ◽  
X Ray Scattering ◽  
Medium Range ◽  
Scattering Study ◽  
Amorphous Silicon Germanium

scholarly journals Composition-dependent stability of the medium-range order responsible for metallic glass formation

2014 ◽  
Vol 81 ◽  
pp. 337-344 ◽  
Author(s):  
Feng Zhang ◽  
Min Ji ◽  
Xiao-Wei Fang ◽  
Yang Sun ◽  
Cai-Zhuang Wang ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Glass Formation ◽  
Range Order ◽  
Medium Range Order ◽  
Medium Range
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