Time-resolved optical Kerr effect on a fragile glass-forming liquid: Test of different mode coupling theory aspects

2000 ◽  
Vol 52 (3) ◽  
pp. 324-329 ◽  
Author(s):  
R Torre ◽  
P Bartolini ◽  
M Ricci ◽  
R. M Pick
Keyword(s):  
Kerr Effect ◽  
Mode Coupling ◽  
Optical Kerr Effect ◽  
Coupling Theory ◽  
Mode Coupling Theory ◽  
Time Resolved ◽  
Glass Forming ◽  
Fragile Glass

Time-resolved optical Kerr effect in m-toluidine: A test of mode-coupling theory predictions

1999 ◽  
Vol 79 (11-12) ◽  
pp. 1897-1905 ◽  
Author(s):  
R. Torre ◽  
M. Ricci ◽  
P. Bartolini ◽  
C. Dreyfus ◽  
R. M. Pick
Keyword(s):  
Kerr Effect ◽  
Mode Coupling ◽  
Optical Kerr Effect ◽  
Coupling Theory ◽  
Mode Coupling Theory ◽  
Time Resolved

Dynamics in a Nonfragile Glass-Forming Liquid

1996 ◽  
Vol 455 ◽  
Author(s):  
B. Rufflé ◽  
S. Beaufils ◽  
J. Etrillard ◽  
J. Gallier ◽  
B. Toudic ◽  
...  
Keyword(s):  
Structural Relaxation ◽  
Mode Coupling ◽  
Low Frequency ◽  
Large Temperature ◽  
Coupling Theory ◽  
Mode Coupling Theory ◽  
Glass Forming ◽  
Real Change ◽  
Wide Energy ◽  
Fragile Glass

ABSTRACTThe dynamics of Na0.5Li0.5PO3 (Tg = 515 K, Tm = 749 K) a non fragile glass forming liquid has been investigated over a large temperature range (300 − 1000 K.) and in a wide energy window using various experimental techniques. The susceptibility spectra obtained by coherent neutron scattering and depolarized light scattering between 1 and 104 GHz show mainly two contributions: a low frequency vibrational peak, the so-called Boson peak and a quasielastic component, referred to the βfast process in the mode coupling theory (MCT).The data are discussed in relation to the mode coupling theory for the liquid glass transition. In particular, the temperature evolution of the susceptibility height in the βfast region is compatible with a crossover temperature Tc ∼ 620 K which is also deduced from a power law temperature dependence of the structural relaxation timescale. As a secondary βslow process, observed by 31P NMR, decouples from the structural relaxation timescale also below 600 K, a real change in the dynamics seems to occur around Tc ∼ 620 K = 1.2 Tg in this non fragile glass Conning liquid.

Time-resolved optical Kerr effect in a fragile glass-forming liquid, salol

1998 ◽  
Vol 57 (2) ◽  
pp. 1912-1920 ◽  
Author(s):  
Renato Torre ◽  
Paolo Bartolini ◽  
Robert Pick
Keyword(s):  
Kerr Effect ◽  
Optical Kerr Effect ◽  
Time Resolved ◽  
Glass Forming ◽  
Fragile Glass

scholarly journals Structure and dynamics of glass-forming alloy melts investigated by application of levitation techniques

2019 ◽  
Vol 91 (6) ◽  
pp. 895-910 ◽  
Author(s):  
Dirk Holland-Moritz ◽  
Benedikt Nowak ◽  
Fan Yang ◽  
Andreas Meyer
Keyword(s):  
Mode Coupling ◽  
Short Range ◽  
Structural Information ◽  
Coupling Theory ◽  
Mode Coupling Theory ◽  
Self Diffusion ◽  
Glass Forming ◽  
Input Mode ◽  
Quasielastic Neutron ◽  
Short Range Structure

Abstract In this work results of studies on the short-range order and on the atomic dynamics in different stable and undercooled glass-forming metallic melts are reviewed. In order to undercool the melts deeply below the melting temperature and to avoid chemical reactions of the melts with crucible materials, the samples are containerlessly processed utilizing the electromagnetic or the electrostatic levitation technique. The short-range structure of the melts is studied by neutron diffraction, while the atomic dynamics are investigated by quasielastic neutron scattering. The relationship between short-range structure and atomic dynamics is discussed within the mode coupling theory of the glass transition. We will show that taking the time- and space-averaged structural information provided by measured partial structure factors as an input, mode coupling theory is able to explain the experimental results concerning the activation energies for self-diffusion and the coupling/decoupling behavior of the self-diffusion coefficients of the different alloy components.

Quasi-Elastic Neutron Scattering Study of the Fragile Glass-Former Salol

1995 ◽  
Vol 407 ◽  
Author(s):  
J. Toulouse ◽  
R. Pick ◽  
C. Dreyfus
Keyword(s):  
Neutron Scattering ◽  
Mode Coupling ◽  
Liquid Glass ◽  
Coupling Theory ◽  
Mode Coupling Theory ◽  
Elastic Neutron ◽  
Scattering Study ◽  
Elastic Neutron Scattering ◽  
Neutron Scattering Study ◽  
Fragile Glass

ABSTRACTQuasi-elastic neutron scattering (NS) measurements of Salol have been carried out in order to study the α and β relaxations near the liquid-glass transition. The results are presented in the form of a susceptibility spectrum that is compared with the corresponding spectrum obtained from light scattering (LS) and with the predictions from the Mode Coupling Theory. The differences between the NS and LS results are due to the different correlators contributing to the susceptibility in the two types of scattering. The possible origin of these differences are discussed in the framework of the Mode Coupling Theory.

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