|Author||Lewis, R. M. ♦ Keller, J. B.|
|Source||United States Department of Energy Office of Scientific and Technical Information|
|Subject Keyword||PHYSICS ♦ CRYSTALS ♦ DEBYE TEMPERATURE ♦ DIFFERENTIAL EQUATIONS ♦ DISTRIBUTION ♦ ENERGY ♦ FUNCTIONALS ♦ LATTICES ♦ MECHANICS ♦ MELTING POINTS ♦ OSCILLATIONS ♦ QUANTITATIVE ANALYSIS ♦ STATISTICS ♦ TEMPERATURE ♦ THERMODYNAMICS|
|Abstract||The s-particle distribution functicns (s = 1,2,...) of classical equilibrium statistical mechanics are determined for a cryatal, as power series in the temperature. They are obtained by solving Bogolyubov's functional differential equation. From the distribution functions, the thermodynamic functions of a crystal are computed as power series in the temperature. The leading terms in these series are the usual classical results which are customarily derived by assuming that the potential energy is a quadratic function of the particle displacements. The further terms, which depend upon the nonquadratic or acharmonic terms in the potential, provide corrections to the usual results, which become more important as the temperature increases. If only a few terms in the series are used, the results will be valid at temperatures low compared to some characteristic temperature of the crystal, e.g., the melting temperature. Since they are based on classical mechanics, the results are valid only at temperatures high compared to the Debye temperature. (auth)|
|Learning Resource Type||Article|
|Publisher Department||New York Univ., N.Y.|
|Organization||New York Univ., N.Y.|
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