TY - JOUR
T1 - Self-organization in network glasses
AU - Thorpe, M. F.
AU - Jacobs, D. J.
AU - Chubynsky, M. V.
AU - Phillips, J. C.
N1 - Funding Information:
Some of the ideas in this paper concerning non-random networks and the fictive temperature were developed in discussions between one of us (MFT) and the late Frank L. Galeener to whom this paper is dedicated. We acknowledge useful ongoing discussions with Punit Boolchand. This work was supported in part by NSF grants DMR-9632182 and CHE-9224102.
PY - 2000/5/1
Y1 - 2000/5/1
N2 - The continuous random network model is widely used as a realistic description of the structure of covalent glasses and amorphous solids. We point out that in real glasses and amorphous materials, there are non-random structural elements that go beyond just simple chemical ordering. We propose that the network can self-organize at its formation or fictive temperature, and examine some of the possible consequences of such self-organization. We find that the absence of small rings can cause the mechanical threshold to change from a second order to a first order transition. We show that if stressed regions are inhibited in the network, then there are two-phase transitions and an intermediate phase that is rigid but stress-free. This intermediate phase is bounded by a second order transition on one side and a first order transition on the other. Recent experiments in chalcogenide glasses give evidence for this intermediate phase.
AB - The continuous random network model is widely used as a realistic description of the structure of covalent glasses and amorphous solids. We point out that in real glasses and amorphous materials, there are non-random structural elements that go beyond just simple chemical ordering. We propose that the network can self-organize at its formation or fictive temperature, and examine some of the possible consequences of such self-organization. We find that the absence of small rings can cause the mechanical threshold to change from a second order to a first order transition. We show that if stressed regions are inhibited in the network, then there are two-phase transitions and an intermediate phase that is rigid but stress-free. This intermediate phase is bounded by a second order transition on one side and a first order transition on the other. Recent experiments in chalcogenide glasses give evidence for this intermediate phase.
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U2 - 10.1016/s0022-3093(99)00856-x
DO - 10.1016/s0022-3093(99)00856-x
M3 - Conference article
AN - SCOPUS:0001248516
SN - 0022-3093
VL - 266-269 B
SP - 859
EP - 866
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
T2 - 18th International Conference on Amorphous and Microcrystalline Semiconductors - Sicence and Technology (ICAMS 18)
Y2 - 23 August 1999 through 27 August 1999
ER -