TY - JOUR
T1 - Topological Origin of the Network Dilation Anomaly in Ion-Exchanged Glasses
AU - Wang, Mengyi
AU - Smedskjaer, Morten M.
AU - Mauro, John C.
AU - Sant, Gaurav
AU - Bauchy, Mathieu
N1 - Funding Information:
We are grateful for valuable discussions with A. Tandia, K.D. Vargheese, and J. Luo of Corning Incorporated. This work is funded by Corning Incorporated. G.N.S. acknowledges the National Science Foundation (CAREER Program, Grant No.1253269) for partial support of this work.
Publisher Copyright:
© 2017 American Physical Society.
PY - 2017/11/21
Y1 - 2017/11/21
N2 - Ion exchange is commonly used to strengthen oxide glasses. However, the resulting stuffed glasses usually do not reach the molar volume of as-melted glasses of similar composition - a phenomenon known as the network dilation anomaly. This behavior seriously limits the potential for the chemical strengthening of glasses and its origin remains one of the mysteries of glass science. Here, based on molecular dynamics simulations of sodium silicate glasses coupled with topological constraint theory, we show that the topology of the atomic network controls the extent of ion-exchange-induced dilation. We demonstrate that isostatic glasses do not show any network dilation anomaly. This is found to arise from the combined absence of floppy modes of deformation and internal eigenstress in isostatic atomic networks.
AB - Ion exchange is commonly used to strengthen oxide glasses. However, the resulting stuffed glasses usually do not reach the molar volume of as-melted glasses of similar composition - a phenomenon known as the network dilation anomaly. This behavior seriously limits the potential for the chemical strengthening of glasses and its origin remains one of the mysteries of glass science. Here, based on molecular dynamics simulations of sodium silicate glasses coupled with topological constraint theory, we show that the topology of the atomic network controls the extent of ion-exchange-induced dilation. We demonstrate that isostatic glasses do not show any network dilation anomaly. This is found to arise from the combined absence of floppy modes of deformation and internal eigenstress in isostatic atomic networks.
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U2 - 10.1103/PhysRevApplied.8.054040
DO - 10.1103/PhysRevApplied.8.054040
M3 - Article
AN - SCOPUS:85036645356
SN - 2331-7019
VL - 8
JO - Physical Review Applied
JF - Physical Review Applied
IS - 5
M1 - 054040
ER -