To the Question of Validity Grüneisen Solid State Equation ()

Vladimir Kh. Kozlovskiy

Jewish Scientific Society, Berlin, Germany.

**DOI: **10.4236/wjcmp.2012.24038
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Jewish Scientific Society, Berlin, Germany.

The first justified theory of solid state was proposed by Grüneisen in the year 1912 and was based on the virial theorem. The forces of interaction between two atoms were assumed as changing with distance between them according to inverse power laws. But only virial theorem is insufficient to deduce the equation of state, so this author has introduced some relations, which are correct, when the forces linearly depend on displacement of atoms. But with such law of interaction the phase transitions cannot take place. Debye received Grüneisen equation in another way. He deduced the expression for thermocapacity, using Plank formula for energy of harmonic vibrator. Taking into account the dependence of atomic vibration frequency from distance between atoms, when the forces of interaction are anharmonic, he received the equation of state, which in classical limit turns to Grüneisen equation. The question, formulated by Debye is—How can we come to phase transitions, when Plank formula for harmonic vibrator was used? Debye solved this question not perfectly, because he was born to small anharmonicity. In the presented work a chain of atoms is considered, and their movement is analysed by means of relations, equivalent to virial theorem and theorem of Lucas (disappearing of mean force). Both are the results of variation principle of Hamilton. The Grüneisen equation for low temperature (not very low, where quantum expression for energy is essential) was obtained, and a family of isotherms and isobars are drown, which show the existence of spinodals, where phase transitions occur. So, Grüneisen equation is an equation of state for low temperatures.

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V. Kozlovskiy, "To the Question of Validity Grüneisen Solid State Equation," *World Journal of Condensed Matter Physics*, Vol. 2 No. 4, 2012, pp. 219-227. doi: 10.4236/wjcmp.2012.24038.

Conflicts of Interest

The authors declare no conflicts of interest.

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