MSE201 Thermodynamics and Phase Equilibria

L-32

16-10-15 (Friday)

Sievert‘s Law, activity and alternative standard states, dilute solutions and interaction parameters.

Chapter 13: Gaskell

Dilute solutions and interaction parameters.

Interaction coefficient:

Therefore, the activity coefficient of B when several other solutes are present:

Interaction parameter:

Comparing the two:

Or, if composition is expressed in wt%

Example of nitrogen dissolved in liquid iron and effect of other alloying elements:

Otherwise,

Summation over all the solutes