Equation of State at T ≠ 0. Grüneisen Parameter
At a temperature T other than that of absolute zero, every atom in a solid has additional kinetic energy. This energy represents the vibrational motion of atoms about their equilibrium positions at lattice sites. This energy, and consequently the amplitude of the vibrations, increases with increasing temperature. A substance is solid if its temperature is sufficiently low. The value of kT should be small compared with the binding energy of atoms in a crystal. Consequently, the amplitudes of thermal vibrations in a solid are always small compared with the interatomic distances (lattice constants).
KeywordsEquilibrium Position Debye Temperature Lattice Vibration Volume Dependence Normal Vibration
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