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0K时冰的性质:水模型的检验

Properties of ices at 0 K: a test of water models.

作者信息

Aragones J L, Noya E G, Abascal J L F, Vega C

机构信息

Departamento de Química Física, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain.

出版信息

J Chem Phys. 2007 Oct 21;127(15):154518. doi: 10.1063/1.2774986.

Abstract

The properties of ices Ih, II, III, V, and VI at zero temperature and pressure are determined by computer simulation for several rigid water models (SPC/E, TIP5P, TIP4P/Ice, and TIP4P/2005). The energies of the different ices at zero temperature and pressure (relative to the ice II energy) are compared to the experimental results of Whalley [J. Chem. Phys. 81, 4087 (1984)]. TIP4P/Ice and TIP4P/2005 provide a qualitatively correct description of the relative energies of the ices at these conditions. In fact, only these two models provide the correct ordering in energies. For the SPC/E and TIP5P models, ice II is the most stable phase at zero temperature and pressure whereas for TIP4P/Ice and TIP4P/2005 ice Ih is the most stable polymorph. These results are in agreement with the relative stabilities found at higher temperatures. The solid-solid phase transitions at 0 K are determined. The predicted pressures are in good agreement with those obtained from free energy calculations.

摘要

通过计算机模拟,针对几种刚性水模型(SPC/E、TIP5P、TIP4P/Ice和TIP4P/2005)确定了零温度和压力下冰Ih、II、III、V和VI的性质。将不同冰在零温度和压力下的能量(相对于冰II的能量)与Whalley的实验结果[《化学物理杂志》81, 4087 (1984)]进行了比较。TIP4P/Ice和TIP4P/2005对这些条件下冰的相对能量提供了定性正确的描述。事实上,只有这两个模型给出了正确的能量排序。对于SPC/E和TIP5P模型,冰II在零温度和压力下是最稳定的相,而对于TIP4P/Ice和TIP4P/2005,冰Ih是最稳定的多晶型物。这些结果与在较高温度下发现的相对稳定性一致。确定了0 K时的固-固相变。预测的压力与通过自由能计算得到的压力吻合良好。

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