Enthalpy Variation of the Nine Solid Phases of the Binary Molecular Alloys (n-Tricosane:n-Pentacosane) vs. Temperature

The enthalpy variations of pure n-tricosane (n-C₂₃H₄₈), pure n-pentacosane (n-C₂₅H₅₂) and sixteen binary mixtures were determined from 282 to 360 K. The differential enthalpy analyses were carried out on the pure components on the four terminal solid solutions, denoted β_o(C₂₃), β′_o(C₂₃), β′_o(C₂₅), β_o(C₂₅) and on the three intermediate phases, called β″₁, β′₁, β″₂of the binary system (C₂₃:C₂₅) using a calorimeter of the Tian Calvet type. These variations can be represented by an analytical expression, which is derived from Einstein‘s model. The two Rotator phases β-RI and α-RII were also studied. This revised version was published online in July 2006 with corrections to the Cover Date.