Abstract
Studies of network-forming oxide liquids are combined with studies of network-forming chalcogenide glasses to demonstrate a universal dependence of the glass forming fragility on the topological connectivity of the network. This connection between structure and dynamics is congruent with theoretical predictions for a rigidity transition near an average bond number of 2.4, and the common pattern of fragility may be traced via a simple two-state bond model to a common variation of configurational entropy with connectivity. However, in order for this universality to appear the connectivity of the oxide networks must be defined in a progressive manner that accommodates the presence of those rigid structural units that comprise both the short-range and intermediate-range order. Replacement of these robust structural units by equivalent network nodes is necessary but can be viewed as a coarse-graining of the network to a bond lattice of weakest links that are most relevant to zero-frequency properties like the fragility.
| Original language | English |
|---|---|
| Article number | 054202 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 87 |
| Issue number | 5 |
| DOIs | |
| State | Published - Feb 15 2013 |
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All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Electronic, Optical and Magnetic Materials
Cite this
Role of intermediate-range order in predicting the fragility of network-forming liquids near the rigidity transition. / Sidebottom, David L.; Schnell, S. E.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 87, No. 5, 054202, 15.02.2013.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Role of intermediate-range order in predicting the fragility of network-forming liquids near the rigidity transition
AU - Sidebottom, David L.
AU - Schnell, S. E.
PY - 2013/2/15
Y1 - 2013/2/15
N2 - Studies of network-forming oxide liquids are combined with studies of network-forming chalcogenide glasses to demonstrate a universal dependence of the glass forming fragility on the topological connectivity of the network. This connection between structure and dynamics is congruent with theoretical predictions for a rigidity transition near an average bond number of 2.4, and the common pattern of fragility may be traced via a simple two-state bond model to a common variation of configurational entropy with connectivity. However, in order for this universality to appear the connectivity of the oxide networks must be defined in a progressive manner that accommodates the presence of those rigid structural units that comprise both the short-range and intermediate-range order. Replacement of these robust structural units by equivalent network nodes is necessary but can be viewed as a coarse-graining of the network to a bond lattice of weakest links that are most relevant to zero-frequency properties like the fragility.
AB - Studies of network-forming oxide liquids are combined with studies of network-forming chalcogenide glasses to demonstrate a universal dependence of the glass forming fragility on the topological connectivity of the network. This connection between structure and dynamics is congruent with theoretical predictions for a rigidity transition near an average bond number of 2.4, and the common pattern of fragility may be traced via a simple two-state bond model to a common variation of configurational entropy with connectivity. However, in order for this universality to appear the connectivity of the oxide networks must be defined in a progressive manner that accommodates the presence of those rigid structural units that comprise both the short-range and intermediate-range order. Replacement of these robust structural units by equivalent network nodes is necessary but can be viewed as a coarse-graining of the network to a bond lattice of weakest links that are most relevant to zero-frequency properties like the fragility.
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U2 - 10.1103/PhysRevB.87.054202
DO - 10.1103/PhysRevB.87.054202
M3 - Article
VL - 87
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 1098-0121
IS - 5
M1 - 054202
ER -