Diffusion in multicomponent metallic systems. X. Diffusion at and near ternary critical states

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Abstract
The thermodynamics of ternary solutions near critical states is given a new formulation and the inferences for the ternary diffusion matrix are developed therefrom. Recognizing with Onsager that the diffusion matrix is proportional to the product of the mobility matrix and the Hessian of the Gibbs' free energy, it is demonstrated that for all ternary critical states (d2F = d3F = 0) the determinant of the diffusion matrix is stationary and zero while all the elements of the matrix are stationary as well. At a ternary critical point, if it exists, all elements of the matrix are zero.

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