New insights into the complex nature of the liquid-to-glasstransition NaturePhysics
. The latter marks the boundary between liquid and solid, which usually is defined at a viscosity value of 10occurs smoothly, that is, without a discontinuous jump of the viscosity. Below, most physical quantities of a glass-former exhibit a cross-over to weaker temperature dependence, that is, a jump in their derivatives, at first glance reminiscent of a second-order phase transition. This is also the case for the volume as well as the thermal expansion, which is considered in the present work.
The dotted black lines show the slopes at the attractive parts of the potentials, which are smaller for lower binding energy. The dashed lines indicate the average location of the particle, which shifts to the right for higher temperature, leading to thermal expansion. For the deeper potential, the particle position is shown for two temperatures.
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