Thermodynamics - quasichemical models
Channel: bhadeshia123
Date: 19/10/2020

The ideal solution model involves no enthalpy of mixing, the atoms within being randomly distributed. Although the regular solution model has a finite enthalpy of mixing, it too assumes a random distribution of atoms for the purposes of the configurational entropy of mixing. The quasichemical model is based on independent pairs of atoms rather than individual atoms. It corrects the configurational entropy to account for the non-random distribution of atoms when the enthalpy of solution is finite.




H. K. D. H. Bhadeshia
University of Cambridge
https://www.phase-trans.msm.cam.ac.uk/teaching.html