The phonon theory of liquid thermodynamics.

The phonon theory of liquid thermodynamics.
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DOI:
10.1038/srep00421
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发表时间:
2012
期刊:
影响因子:
4.6
通讯作者:
Trachenko, K.
Trachenko, K.
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Bolmatov, D.;Brazhkin, V. V.;Trachenko, K.

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物质的热容被认为是其最重要的属性,因为它包含了系统自由度的信息,以及系统运行的状态,无论是经典的还是量子的。热容在气体和固体中被很好地理解,但在物质的第三种主要状态,液体中却没有,因此在物理教科书中没有讨论。感知到的困难是液体中的相互作用既强又具有系统特异性,这意味着能量强烈依赖于液体类型,因此,液体能量不能以一般形式计算。在这里,我们发展了一种液体声子理论,避免了这个问题。该理论涵盖了经典和量子体制。我们证明了21种液体,包括贵金属、金属、分子和氢键网络液体,在很宽的温度和压力范围内的计算和实验热容是一致的。
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 main 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. Here, we develop a phonon theory of liquids where this problem is avoided. The theory covers both classical and quantum regimes. We demonstrate good agreement of calculated and experimental heat capacity of 21 liquids, including noble, metallic, molecular and hydrogen-bonded network liquids in a wide range of temperature and pressure.
DOI: 10.1098/rspa.1946.0093
发表时间: 1946-01-01
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