Physical vapor deposition of a polyamorphic system: Triphenyl phosphite

Beasley, M. S.; Kasting, B. J.; Tracy, M.E.; Guiseppi‐Elie, Anthony; Richert, Ranko; Ediger, M. D.

doi:10.1063/5.0019872

Cited by 7 publications

(2 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[42][43][44][45] According to the two-order-parameter model, 45 these amorphous phases have different structures, configurational entropy, and relaxation dynamics. [46][47][48][49][50][51][52][53] Hence, they might serve as ideal model systems to provide crucial information on these poorly understood problems if structural changes can be finely controlled in the same chemical composition.…”

Section: Articlementioning

confidence: 99%

Structural length-scale of β relaxation in metallic glass

Yang

Wei

et al. 2022

The Journal of Chemical Physics

View full text Add to dashboard Cite

Establishing the structure-property relationship is an important goal of glassy materials but is usually impeded by the disordered structures and the non-equilibrium nature. Recent studies have illustrated that secondary (β) relaxation is a property-handler in a range of glassy maters. However, it has been challenging to identify pertinent structural features governing it. In this work, we show that the so-called polyamorphous transition in metallic glasses offers an opportunity to distinguish the structural length scale of β relaxation. We find that while the glass transition temperature and medium-range orders (MRO) change rapidly across the polyamorphous transition, the intensity of β relaxation and the short-range orders (SROs) evolve in a similar way as that in an ordinary reference glass without polyamorphous transition. Our findings suggest that the MRO accounts mainly for the global stiffening of the materials and the glass transition, while the SRO contributes more to β relaxation per se.

show abstract

Section: Articlementioning

confidence: 99%

Structural length-scale of β relaxation in metallic glass

Yang

Wei

et al. 2022

The Journal of Chemical Physics

View full text Add to dashboard Cite

show abstract

“…For example, at high pressures, high-and low-density supercooled water phases are interconvertible through a first-order phase transition (27,28). Recent studies have demonstrated that such polyamorphic states can also be accessed through PVD in hydrogen-bonding systems with polymorphic crystal states at depositions above the nominal Tg (29,30). However, these structure-specific transitions do not provide a general resolution for the Kauzmann crisis.…”

Section: Significancementioning

confidence: 99%

Glasses denser than the supercooled liquid

Jin

Zhang

Wolf

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

When aged below the glass transition temperature, Tg, the density of a glass cannot exceed that of the metastable supercooled liquid (SCL) state, unless crystals are nucleated. The only exception is when another polyamorphic SCL state exists, with a density higher than that of the ordinary SCL. Experimentally, such polyamorphic states and their corresponding liquid–liquid phase transitions have only been observed in network-forming systems or those with polymorphic crystalline states. In otherwise simple liquids, such phase transitions have not been observed, either in aged or vapor-deposited stable glasses, even near the Kauzmann temperature. Here, we report that the density of thin vapor-deposited films of N,N′-bis(3-methylphenyl)-N,N′-diphenylbenzidine (TPD) can exceed their corresponding SCL density by as much as 3.5% and can even exceed the crystal density under certain deposition conditions. We identify a previously unidentified high-density supercooled liquid (HD-SCL) phase with a liquid–liquid phase transition temperature (TLL) ∼35 K below the nominal glass transition temperature of the ordinary SCL. The HD-SCL state is observed in glasses deposited in the thickness range of 25 to 55 nm, where thin films of the ordinary SCL have exceptionally enhanced surface mobility with large mobility gradients. The enhanced mobility enables vapor-deposited thin films to overcome kinetic barriers for relaxation and access the HD-SCL state. The HD-SCL state is only thermodynamically favored in thin films and transforms rapidly to the ordinary SCL when the vapor deposition is continued to form films with thicknesses more than 60 nm.

show abstract

Ultrastable glasses: new perspectives for an old problem

et al. 2022

View full text Add to dashboard Cite

Ultrastable glasses (mostly prepared from the vapor phase under optimized deposition conditions) represent a unique class of materials with low enthalpies and high kinetic stabilities. These highly stable and dense glasses show unique physicochemical properties, such as high thermal stability, improved mechanical properties or anomalous transitions into the supercooled liquid, offering unprecedented opportunities to understand many aspects of the glassy state. Their improved properties with respect to liquid-cooled glasses also open new prospects to their use in applications where liquid-cooled glasses failed or where not considered as usable materials. In this review article we summarize the state of the art of vapor-deposited (and other) ultrastable glasses with a focus on the mechanism of equilibration, the transformation to the liquid state and the low temperature properties. The review contains information on organic, metallic, polymeric and chalcogenide glasses and an updated list with relevant properties of all materials known today to form a stable glass.

show abstract

Physical vapor deposition of a polyamorphic system: Triphenyl phosphite

Cited by 7 publications

References 50 publications

Structural length-scale of β relaxation in metallic glass

Structural length-scale of β relaxation in metallic glass

Glasses denser than the supercooled liquid

Ultrastable glasses: new perspectives for an old problem

Contact Info

Product

Resources

About