Analysis of the pressure dependence of the thermal expansivity of NaCl crystal

Abstract

7 ' 1~ pressure tlepentlrnce of the thermal expansivity ( a ) of NaCl crystal has been studied using various relations hetween a and the Anderson parameter 6. The variation of 6 with pressure has been estimated anti t,akeri into account for determining the pressure dependence of a. A comparison of the results derived from various models has been presented with available experimental data. It is found that the Anderson power law for the pressure dependence of 6 is more consistent with the experimental data.

Analysis of the Pressure Dependence of Thermal Expansivity

“…(3) as Anderson formula. More recently, Thomas and Shanker [3] complied some relations pointed out by earlier workers for the determination of thermal expansivity under the effect of pressure. We discuss all the relations, advocated by Thomas and Shanker [3], in the light of Anderson's formula (equ.…”

“…(5) as derived by Xia and Xiao [10], has been as such rewritten by Thomas and Shanker [3]. It seems from the analysis of these workers [3,10] that equ. (5) is a new relation, which is not correct.…”

“…(3). Thus, the relation of Xia and Xiao [10] as used by Thomas and Shanker [3] is the same as Anderson's formula. The relation for thermal expansivity derived by Fernandez et al [12] as rewritten by Thomas and Shanker, reads as follows [3]:…”

“…This indicates very clearly that these relations are the same. Equation (11) of Thomas and Shanker [3] which is the expression for the pressure dependence of d T , as derived by Guillermet [13] is given below [3],…”

“…(3)). Thomas and Shanker [3] followed the work of Xia and Xiao [10] that can be discussed as follows. In 1993, Xia and Xiao [10] derived a relation for the thermal expansivity under the effect of pressure.…”