Statistical mechanical calculation of aluminum-silicon disorder in albite Available to Purchase

Equilibrium silicon-aluminum disorder in albite is computed on the basis of statistical-mechanical order-disorder theory. The quasi-chemical approximation is used, and the aluminum avoidance principle is taken into account. A limiting high temperature configurational entropy of 1.57 R per mole of Al is obtained. It is argued that a T₁₀ site preference energy, as well as Al–Si interaction energy, is required for the model to be realistic. The configurational entropy and order parameter are calculated as functions of temperature.