Heat capacity of liquids: an approach from the solid phase

Details Heat capacity of liquids: an approach from the solid phase Heat capacity of liquids: an approach from the solid phase

2008-07-24

arxiv.org/abs/0807.3871v2

See Physical Review B 78, 104201 (2008)

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1103/PhysRevB.78.104201

We calculate the energy and heat capacity of a liquid on the basis of its elastic properties and vibrational states. The experimental decrease of liquid heat capacity with temperature is attributed to the increasing loss of two transverse modes with frequency $\omega<1/\tau$, where $\tau$ is liquid relaxation time. In a simple model, liquid heat capacity is related to viscosity and is compared with the experimental data of mercury. We also calculate the vibrational energy of a quantum liquid, and show that transverse phonons can not be excited in the low-temperature limit. Finally, we discuss the implications of the proposed approach to liquids for the problem of glass transition.

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