Ultrastable glasses portray similar behaviour to ordinary glasses at high pressure.
Pressure experiments provide a unique opportunity to unravel new insights into glass-forming liquids by exploring its effect on the dynamics of viscous liquids and on the evolution of the glass transition temperature. Here we compare the pressure dependence of the onset of devitrification, Ton, between two molecular glasses prepared from the same material but with extremely different ambient-pressure kinetic and thermodynamic stabilities. Our data clearly reveal that, while both glasses exhibit different dTon/dP values at low pressures, they evolve towards closer calorimetric devitrification temperature and pressure dependence as pressure increases. We tentatively interpret these results from the different densities of the starting materials at room temperature and pressure. Our data shows that at the probed pressures, the relaxation time of the glass into the supercooled liquid is determined by temperature and pressure similarly to the behaviour of liquids, but using stability-dependent parameters.
Grup de Nanomaterials i Microsistemes, Departament de Física, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain.
C
C
Rodríguez-Tinoco
Grup de Nanomaterials i Microsistemes, Departament de Física, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain.
M
M
González-Silveira
Grup de Caracterització de Materials, ETSEIB, Departament de Física, Universitat Politècnica de Catalunya, Diagonal 647, 08028 Barcelona, Spain.
M
M
Barrio
Grup de Caracterització de Materials, ETSEIB, Departament de Física, Universitat Politècnica de Catalunya, Diagonal 647, 08028 Barcelona, Spain.
P
P
Lloveras
Grup de Caracterització de Materials, ETSEIB, Departament de Física, Universitat Politècnica de Catalunya, Diagonal 647, 08028 Barcelona, Spain.
J Ll
JL
Tamarit
CNRS, Inst NEEL, F-38000 Grenoble, France.|Univ. Grenoble Alpes, Inst NEEL, F-38000 Grenoble, France.
J-L
JL
Garden
Grup de Nanomaterials i Microsistemes, Departament de Física, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain.
J
J
Rodríguez-Viejo
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