scholarly journals Experimental evidence for excess entropy discontinuities in glass-forming solutions

2012 ◽  
Vol 136 (7) ◽  
pp. 074515 ◽  
Author(s):  
Daniel M. Lienhard ◽  
Bernhard Zobrist ◽  
Andreas Zuend ◽  
Ulrich K. Krieger ◽  
Thomas Peter
Keyword(s):  
Experimental Evidence ◽  
Excess Entropy ◽  
Glass Forming

scholarly journals Response to “Comment on ‘Experimental evidence for excess entropy discontinuities in glass-forming solutions”’ [J. Chem. Phys. 139, 047101 (2013)]

2013 ◽  
Vol 139 (4) ◽  
pp. 047102
Author(s):  
Daniel M. Lienhard ◽  
Bernhard Zobrist ◽  
Andreas Zuend ◽  
Ulrich K. Krieger ◽  
Thomas Peter
Keyword(s):  
Experimental Evidence ◽  
Excess Entropy ◽  
Chem Phys ◽  
Glass Forming

scholarly journals Experimental evidence for a glass forming stripe liquid in the magnetic ground state ofLa1.65Eu0.2Sr0.15CuO4

2003 ◽  
Vol 68 (1) ◽  
Author(s):  
B. Simovič ◽  
P. C. Hammel ◽  
M. Hücker ◽  
B. Büchner ◽  
A. Revcolevschi
Keyword(s):  
Experimental Evidence ◽  
Ground State ◽  
Magnetic Ground State ◽  
Glass Forming

scholarly journals Structural predictor for nonlinear sheared dynamics in simple glass-forming liquids

2017 ◽  
Vol 115 (1) ◽  
pp. 87-92 ◽  
Author(s):  
Trond S. Ingebrigtsen ◽  
Hajime Tanaka
Keyword(s):  
Excess Entropy ◽  
Nonlinear Behavior ◽  
Liquid Structure ◽  
Theoretical Understanding ◽  
Glass Forming ◽  
Pair Potentials ◽  
Wide Range ◽  
Strong Shear ◽  
Powerful Approach ◽  
Nonlinear Nature

Glass-forming liquids subjected to sufficiently strong shear universally exhibit striking nonlinear behavior; for example, a power-law decrease of the viscosity with increasing shear rate. This phenomenon has attracted considerable attention over the years from both fundamental and applicational viewpoints. However, the out-of-equilibrium and nonlinear nature of sheared fluids have made theoretical understanding of this phenomenon very challenging and thus slower to progress. We find here that the structural relaxation time as a function of the two-body excess entropy, calculated for the extensional axis of the shear flow, collapses onto the corresponding equilibrium curve for a wide range of pair potentials ranging from harsh repulsive to soft and finite. This two-body excess entropy collapse provides a powerful approach to predicting the dynamics of nonequilibrium liquids from their equilibrium counterparts. Furthermore, the two-body excess entropy scaling suggests that sheared dynamics is controlled purely by the liquid structure captured in the form of the two-body excess entropy along the extensional direction, shedding light on the perplexing mechanism behind shear thinning.

AN ANALYSIS OF THERMOPHYSICAL AND MECHANICAL PROPERTIES OF GLASS-FORMING ALLOYS

2007 ◽  
Vol 1048 ◽  
Author(s):  
Livio Battezzati ◽  
Daniele Baldissin ◽  
Marcello Baricco ◽  
Tanya Aycan Baser ◽  
Donato Firrao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Glass Transition ◽  
Shear Band ◽  
Finite Element Modelling ◽  
Energy Content ◽  
Excess Entropy ◽  
Temperature Profiles ◽  
Element Modelling ◽  
Glass Forming ◽  
Insight Into

AbstractMetallic glass-forming liquids and glasses are ranked using thermophysical properties (glass transition, excess entropy, fragility indexes). The relationships between mechanical properties and some of the above quantities are discussed to get insight into the mechanism of shear band propagation during mechanical failure when, following up a shear offset event, a local temperature rise occurs. The mechanism is supported by evaluating the energy content of the shear band, as well as finite element modelling of temperature profiles around it.

Kinetics of Glass Formation by Solidification and Melting

1990 ◽  
Vol 205 ◽  
Author(s):  
Hans J. Fecht
Keyword(s):  
Glass Transition ◽  
Specific Heat ◽  
Glass Formation ◽  
Excess Entropy ◽  
Crystalline Solid ◽  
Thermally Activated ◽  
Glass Forming ◽  
Local Fluctuations ◽  
Measured Specific Heat ◽  
Kinetics Of

AbstractA scenario has been developed combining the glass transition (liquid to glass) with the crystal-to glass transition. If the “melting” point of a crystalline solid solution is reduced to the ideal glass transition temperature a triple point is predicted between crystal, liquid and glass. Based on extrapolations of measured specific heat data of undercooled liquid glass-forming Au- Pb-Sb alloys the excess entropy is found to vanish close to the glass transition. On the other hand, the amorphization reaction of crystalline Fe2Er-hydrides is characterized by a lambda-type anomaly in the specific heat. The logarithmic temperature-dependence of the specific heat results from local fluctuations in the crystalline phase, rather than thermally activated lattice defects. These results suggest that glass formation from the liquid as well as the crystalline state is characterized by an underlying instability.

Thermodynamic and kinetic fragilities of Mg-based bulk metallic glass-forming liquids

2008 ◽  
Vol 23 (10) ◽  
pp. 2816-2820 ◽  
Author(s):  
H. Ma ◽  
H-J. Fecht
Keyword(s):  
Relaxation Time ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Metallic Glass ◽  
Temperature Dependence ◽  
Bulk Metallic Glass ◽  
Excess Entropy ◽  
Gibbs Equation ◽  
Glass Forming

The thermodynamic and kinetic fragilities of two near-eutectic Mg-based bulk metallic glass (BMG)-forming liquids, Mg61Cu28Gd11 and Mg59.5Cu22.9Ag6.6Gd11, were investigated using high-precision differential scanning calorimeter (DSC). The thermodynamic fragility denoted as F3/4 was determined by evaluating the temperature dependence of the excess entropy Sex. The heating rate dependence of the relaxation time at the glass transition temperature was investigated to measure the kinetic fragility. A positive correlation between the thermodynamic and kinetic fragilities could be established in Mg-based BMG-forming liquids on the basis of Adam-Gibbs equation in contrast to a number of other BMGs.

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