L
Liping Huang
Researcher at Rensselaer Polytechnic Institute
Publications - 108
Citations - 2940
Liping Huang is an academic researcher from Rensselaer Polytechnic Institute. The author has contributed to research in topics: Glass transition & Raman spectroscopy. The author has an hindex of 27, co-authored 100 publications receiving 2342 citations. Previous affiliations of Liping Huang include North Carolina State University & Zhejiang University.
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Amorphous-amorphous transitions in silica glass. I. Reversible transitions and thermomechanical anomalies
Liping Huang,John Kieffer +1 more
Abstract: Amorphous-amorphous transitions in silica glass under a variety of thermomechanical conditions are studied with molecular-dynamics simulations using a charge-transfer three-body potential model. The polyamorphic transitions can be reversible or irreversible depending on the combination of pressure and temperature at which the transitions take place. Anomalous thermomechanical behaviors of silica glass, such as an increase of the mechanical moduli upon expansion as a result of tensile deformation or thermal expansion, are well reproduced in our simulations. In part I, we show these anomalies are due to reversible structural transitions, which activate similar structural modes of displacement as in the $\ensuremath{\alpha}$-to-$\ensuremath{\beta}$ phase transformations in cristobalite silica. The emergence of dynamic instabilities is observed in conjunction with these reversible structural changes, characterizing them as transitions rather than gradual deformations. The polyamorphic transitions are gradual and localized in silica glass in contrast to the instantaneous and extended character of polymorphic transformation in crystals. The mechanism of the irreversible transitions, the negative thermal expansion of silica glass under pressure, as well as the effect of pressure and temperature on the permanent densification of silica glass and the nature of the newly discovered amorphous phases are discussed in part II.
Journal ArticleDOI
Brittle to ductile transition in densified silica glass.
Fenglin Yuan,Liping Huang +1 more
TL;DR: This study used a pressure quenching route to tune the structure of silica glass in a controllable manner, and observed a systematic increase in ductility in samples quenched under increasingly higher pressure.
Journal ArticleDOI
Molecular dynamics study of cristobalite silica using a charge transfer three-body potential: Phase transformation and structural disorder
Liping Huang,John Kieffer +1 more
TL;DR: In this article, structural and dynamic properties of cristobalite silica have been studied using molecular dynamics simulations based on a charge transfer three-body potential model, where the directional covalent bonding of SiO 2 is characterized by the charge transfer function of the interatomic distance between Si and O atoms, and in the form of Si−O−Si and O−Si−Othree-body interactions.
Journal ArticleDOI
Amorphous-amorphous transitions in silica glass. II. Irreversible transitions and densification limit
Liping Huang,John Kieffer +1 more
Journal ArticleDOI
Structure and Properties of Silica Glass Densified in Cold Compression and Hot Compression
Michael Guerette,Michael R. Ackerson,Jay B. Thomas,Fenglin Yuan,E. Bruce Watson,David Walker,Liping Huang +6 more
TL;DR: The studies demonstrate the limitation of the resulting density as a structural indicator of polyamorphism, and point out the importance of temperature during compression in order to fundamentally understand HDA silica.