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**Stastistical-thermodynamic study of nonequilibrium phenomena in three-dimensional anharmonic crystal lattices. I: Microscopic basic equations.**
*(English)*
Zbl 1122.82316

Summary: Microscopic basic equations for analyzing nonequilibrium phenomena in three-dimensional anharmonic crystal lattices at finite temperatures are self-consistently derived from the Liouville equation by adopting both independent particle approximation and Gaussian approximation. The model prescribed by the basic equations can be regarded as the dynamical version of the self-consistent Einstein model, and is valid in a wide temperature range including the melting point. Thermal equilibrium states of several fcc and bcc crystals are also analyzed by using the basic equations. Singularities in the temperature dependences of the nearest-neighbor distance and the amplitude of thermal vibration at the melting point are found, and Lindemann’s law is examined. The results obtained here will be utilized in the analyses in the following papers of the present series.

### MSC:

82C99 | Time-dependent statistical mechanics (dynamic and nonequilibrium) |

80A20 | Heat and mass transfer, heat flow (MSC2010) |

82D25 | Statistical mechanics of crystals |