Correlation between the thermal expansion coefficient and heat capacity of an inert-gas single crystal: Krypton

Abstract

Correlation dependence of volumetric thermal expansion coefficient o(T) on heat capacity C(T) for single-crystal krypton is studied. It is shown that the dependence o(C) is observed not only at low temperatures, where it is linear and is known as the Gruneisen law, but also in a much wider temperature range up to the melting point of krypton. When the specific heat reaches a classical limit of 3R (according to the Dulong-Petit law), the o(C) dependence considerably deviates from the low-temperature linear behavior. The concept of the differential Gruneisen parameter of krypton, gamma' similar to (a,o/a,C), is introduced, and its temperature dependence is estimated.