Dima Bolmatov, Vadim Brazhkin, Kostya Trachenko
Heat capacity of matter is considered to be its most important property
because it holds information about system's degrees of freedom as well as the
regime in which the system operates, classical or quantum. Heat capacity is
well understood in gases and solids but not in the third state of matter,
liquids, and is not discussed in physics textbooks as a result. The perceived
difficulty is that interactions in a liquid are both strong and
system-specific, implying that the energy strongly depends on the liquid type
and that, therefore, liquid energy can not be calculated in general form [1].
Here, we develop a phonon theory of liquids where this problem is avoided. We
demonstrate good agreement of calculated heat capacity of important monatomic,
molecular and hydrogen-bonded network liquids such as H2O in a wide range of
pressure and temperature.
View original:
http://arxiv.org/abs/1202.0459
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