Glass-forming liquid dynamics can be accurately modeled by a simple model of disordered solids

Scilight ◽  
2020 ◽  
Vol 2020 (15) ◽  
pp. 151104
Author(s):  
Anashe Bandari
Keyword(s):  
Simple Model ◽  
Disordered Solids ◽  
Glass Forming ◽  
Liquid Dynamics

Simple model of the diffusive scattering law in glass-forming liquids

1994 ◽  
Vol 49 (22) ◽  
pp. 15607-15614 ◽  
Author(s):  
K. Ruebenbauer ◽  
J. G. Mullen ◽  
G. U. Nienhaus ◽  
G. Schupp
Keyword(s):  
Simple Model ◽  
Glass Forming ◽  
Diffusive Scattering

scholarly journals Long-wavelength fluctuations and anomalous dynamics in 2-dimensional liquids

2019 ◽  
Vol 116 (46) ◽  
pp. 22977-22982 ◽  
Author(s):  
Yan-Wei Li ◽  
Chandan K. Mishra ◽  
Zhao-Yan Sun ◽  
Kun Zhao ◽  
Thomas G. Mason ◽  
...  
Keyword(s):  
System Size ◽  
Vibrational Amplitude ◽  
Relaxation Dynamics ◽  
Colloidal Systems ◽  
Long Wavelength ◽  
Disordered Solids ◽  
Melting Temperatures ◽  
Long Time ◽  
Liquid Dynamics ◽  
Anomalous Dynamics

In 2-dimensional systems at finite temperature, long-wavelength Mermin–Wagner fluctuations prevent the existence of translational long-range order. Their dynamical signature, which is the divergence of the vibrational amplitude with the system size, also affects disordered solids, and it washes out the transient solid-like response generally exhibited by liquids cooled below their melting temperatures. Through a combined numerical and experimental investigation, here we show that long-wavelength fluctuations are also relevant at high temperature, where the liquid dynamics do not reveal a transient solid-like response. In this regime, these fluctuations induce an unusual but ubiquitous decoupling between long-time diffusion coefficient D and structural relaxation time τ, where D∝τ−κ, with κ>1. Long-wavelength fluctuations have a negligible influence on the relaxation dynamics only at extremely high temperatures in molecular liquids or at extremely low densities in colloidal systems.

Glass-Forming Liquids in Mesopores Probed by Solvation Dynamic and Dielectric Techniques

1996 ◽  
Vol 464 ◽  
Author(s):  
X. Yan ◽  
C. Streck ◽  
R. Richert
Keyword(s):  
Slow Component ◽  
Supercooled Liquids ◽  
Bulk Liquid ◽  
Low Molecular Weight ◽  
Solvation Dynamics ◽  
Dielectric Relaxation Spectroscopy ◽  
Glass Forming ◽  
Heterogeneous Samples ◽  
Liquid Dynamics ◽  
Dielectric Results

ABSTRACTThe orientational dynamics of organic supercooled liquids of low molecular weight confined to the geometry of porous glasses are studied by two highly related techniques, the optical method of probing the dynamics of solvation regarding a chromophoric host molecule and dielectric relaxation spectroscopy. The dielectric results display marked effects of the confinement to mesopores in terms of altered structural dynamics which appear to separate into a raster and slower responses relative to the bulk liquid. We also demonstrate that there is no trivial relation between the ε*(ω) data and the liquid dynamics in these heterogeneous samples. These effects are partially paralleled by the solvation dynamics results, but with the spatial range inherent in the optical technique being inconsistent with associating the fast and slow dynamical components to spatially distinct regimes. We conclude on the slow component being a signature of non-ergodicity which arises from the competition between the length scale of cooperativity and the pore size.

Electron Microscopy of Silicon Nitride-Based Ceramics

1991 ◽  
Vol 49 ◽  
pp. 926-927
Author(s):  
Gareth Thomas
Keyword(s):  
Electron Microscopy ◽  
High Temperature ◽  
Silicon Nitride ◽  
World Wide ◽  
Sintering Temperature ◽  
Liquid Phase Sintering ◽  
High Temperature Strength ◽  
Sintering Additives ◽  
Glass Forming ◽  
Dense Product

Silicon nitride and silicon nitride based-ceramics are now well known for their potential as hightemperature structural materials, e.g. in engines. However, as is the case for many ceramics, in order to produce a dense product, sintering additives are utilized which allow liquid-phase sintering to occur; but upon cooling from the sintering temperature residual intergranular phases are formed which can be deleterious to high-temperature strength and oxidation resistance, especially if these phases are nonviscous glasses. Many oxide sintering additives have been utilized in processing attempts world-wide to produce dense creep resistant components using Si3N4 but the problem of controlling intergranular phases requires an understanding of the glass forming and subsequent glass-crystalline transformations that can occur at the grain boundaries.

The effect of an aluminum heat-sink layer on the laser-induced amorphization of SiOx/TeGeSn/SiOx phase-change recording films

1989 ◽  
Vol 47 ◽  
pp. 574-575
Author(s):  
Matthew R. Libera ◽  
Martin Chen
Keyword(s):  
Thin Film ◽  
Phase Change ◽  
Heat Sink ◽  
Multilayer Film ◽  
Glassy Phase ◽  
Film Structure ◽  
Glass Forming ◽  
Active Storage ◽  
Dielectric Layers ◽  
Amorphous States

Phase-change erasable optical storage is based on the ability to switch a micron-sized region of a thin film between the crystalline and amorphous states using a diffraction-limited laser as a heat source. A bit of information can be represented as an amorphous spot on a crystalline background, and the two states can be optically identified by their different reflectivities. In a typical multilayer thin-film structure the active (storage) layer is sandwiched between one or more dielectric layers. The dielectric layers provide physical containment and act as a heat sink. A viable phase-change medium must be able to quench to the glassy phase after melting, and this requires proper tailoring of the thermal properties of the multilayer film. The present research studies one particular multilayer structure and shows the effect of an additional aluminum layer on the glass-forming ability.

Crystallization in Al 88 RE 8 Ni 4 glass-forming alloys

2002 ◽  
Vol 82 (12) ◽  
pp. 2483-2497 ◽  
Author(s):  
T. K. Croat ◽  
A. K. Gangopadhyay ◽  
K. F. K Elton
Keyword(s):  
Glass Forming

Chaos and secular cycles in a structurally simple model society

2012 ◽  
Author(s):  
Alexander Medvinsky ◽  
Alexey Rusakov
Keyword(s):  
Simple Model
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