scholarly journals Systematic broadening of the viscoelastic and calorimetric glass transitions in complex glass-forming liquids

2018 ◽  
Vol 483 ◽  
pp. 10-17 ◽  
Author(s):  
Olli-Ville Laukkanen ◽  
H. Henning Winter ◽  
Hilde Soenen ◽  
Jukka Seppälä
Keyword(s):  
Glass Transitions ◽  
Glass Forming

Universal Behavior near the Glass Transitions in Fragile Glass-Forming Systems

2008 ◽  
Author(s):  
Michio Tokuyama ◽  
Michio Tokuyama ◽  
Irwin Oppenheim ◽  
Hideya Nishiyama
Keyword(s):  
Glass Transitions ◽  
Universal Behavior ◽  
Glass Forming ◽  
Fragile Glass

scholarly journals Disorder-free spin glass transitions and jamming in exactly solvable mean-field models

2018 ◽  
Vol 4 (6) ◽  
Author(s):  
Hajime Yoshino
Keyword(s):  
Mean Field ◽  
Quenched Disorder ◽  
Rotational Degree ◽  
Frustrated Magnets ◽  
Glass Transitions ◽  
Random Energy Model ◽  
Geometrically Frustrated ◽  
Glass Forming ◽  
Exactly Solvable ◽  
Continuous Spins

We construct and analyze a family of MM-component vectorial spin systems which exhibit glass transitions and jamming within supercooled paramagnetic states without quenched disorder. Our system is defined on lattices with connectivity c=\alpha Mc=αM and becomes exactly solvable in the limit of large number of components M \to \inftyM→∞. We consider generic pp-body interactions between the vectorial Ising/continuous spins with linear/non-linear potentials. The existence of self-generated randomness is demonstrated by showing that the random energy model is recovered from a MM-component ferromagnetic pp-spin Ising model in M \to \inftyM→∞ and p \to \inftyp→∞ limit. In our systems the quenched disorder, if present, and the self-generated disorder act additively. Our theory provides a unified mean-field theoretical framework for glass transitions of rotational degree of freedoms such as orientation of molecules in glass forming liquids, color angles in continuous coloring of graphs and vector spins of geometrically frustrated magnets. The rotational glass transitions accompany various types of replica symmetry breaking. In the case of repulsive hardcore interactions in the spin space, the criticality of the jamming or SAT/UNSTAT transition becomes the same as that of hardspheres.

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

Study of the ?-Mechanical Relaxation in Molecular Glass-Forming Liquids

1997 ◽  
Vol 7 (11) ◽  
pp. 1635-1650 ◽  
Author(s):  
A. Faivre ◽  
L. David ◽  
J. Perez
Keyword(s):  
Mechanical Relaxation ◽  
Glass Forming ◽  
Molecular Glass

DELORO 15, 21, 22, 25 ALLOYS

Alloy Digest ◽  
2011 ◽  
Vol 60 (4) ◽  
Keyword(s):  
Physical Properties ◽  
Powder Metal ◽  
Glass Forming ◽  
Nickel Base

Abstract DELORO 15, 21, 22, and 25 are prealloyed, gas-atomized, nickel-base powders for repair of glass-forming molds. This datasheet provides information on composition, physical properties, and hardness. It also includes information on powder metal forms. Filing Code: Ni-689. Producer or source: Stellite Coatings.

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