Glasses denser than the supercooled liquid

Jin, Yi; Zhang, Aixi; Wolf, Sarah E.; Govind, Shivajee; Moore, Alex R.; Zhernenkov, Mikhail; Freychet, Guillaume; Arabi Shamsabadi, Ahmad; Fakhraai, Zahra

doi:10.1073/pnas.2100738118

Glasses denser than the supercooled liquid

Journal Article · Fri Jul 30 00:00:00 EDT 2021 · Proceedings of the National Academy of Sciences of the United States of America

DOI:https://doi.org/10.1073/pnas.2100738118· OSTI ID:1830354

^[1]; ^[1]; ^[1]; ^[1]; Moore, Alex R. ^[1]; ^[2]; ^[2]; Arabi Shamsabadi, Ahmad ^[1]; ^[1]

Univ. of Pennsylvania, Philadelphia, PA (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)

When aged below the glass transition temperature, T_g, 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 (T_LL) ~35 K below the nominal glass transition temperature of the ordinary SCL. Additionally, 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.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704

OSTI ID:: 1830354

Report Number(s):: BNL--222068-2021-JAAM

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 31 Vol. 118; ISSN 0027-8424

Publisher:: National Academy of SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
liquid–liquid phase transition
mobile surface layer
physical vapor deposition
stable glass
thin-film mobility

Glasses denser than the supercooled liquid

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