A relationship to estimate the excess entropy of mixing: Application in silicate solid solutions and binary alloys

Abstract

Highlights► The heat capacity of Pt–Rh and Ag–Pd alloys was measured from 5 to 700 K. ► The Ag–Pd data were compared to those obtained by ab intio calculations. ► The extent of the excess entropy of 10 binaries was described by a simple relation.

Calorimetric study of the entropy relation in the NaCl–KCl system

“…Applying volumes and bulk moduli for halite and sylvite from the literature [26,27], a difference in the end member volumes of Δ V i , m  = 1.05 ⋅ 10 −5  J ⋅ mol −1  ⋅ Pa −1 and a difference in the end member bulk moduli of Δ K i  = −6.75 GPa is obtained. The fit parameters of equation (1) are a  = 1.089 ⋅ 10 −16  J ⋅ mol −1  ⋅ Pa −2 and b  = 2.505 ⋅ 10 5  Pa ⋅ K −1 (the values from [9] were converted to SI units), and results in ${\mathrm{\Delta }}_{\max }{S}_m^{\text{exc}}$ = 2.4 J ⋅ mol −1  ⋅ K −1 , which is in good agreement with the calorimetrically determined value (2.2 J ⋅ mol −1  ⋅ K −1 ).…”

Structural complexity and configurational entropy of crystals

“…Fultz, 2010Fultz, , 2014Benisek et al, 2014). Much less attention was given to the understanding of configurational entropy (Saito & Yamamaura, 2005), except for the order-disorder phase transitions and mixing entropy (Benisek et al, 2014;Benisek & Dachs, 2012, 2015. In general, the configurational entropy of a system represents a portion of its total entropy that depends upon the position of its constituents only, without any regard to their dynamic properties.…”

A calorimetric study of thermodynamic properties for binary Cu–Ge alloys

“…The differential scanning calorimetry (DSC) is an efficient technique for quantitative thermal analysis [27,28]. Meanwhile, the DSC heating-cooling curves provide the essential information on phase transformation characteristics [3,[29][30][31][32].…”