Theory of Disordered Ternary Alloys at Intermediate Temperatures

Expressions for the short-range-order parameters for disordered ternary alloys are given as functions of the system composition and the static two-body configurational potentials of arbitrary range. These expressions are exact to the order ${\left(\frac{T_c}{T}\right)}^3$, where $T_c$ is of the order of the highest temperature at which the system is expected to have any long-range order. A procedure for the computation of this temperature $T_c$ is outlined. It is noted that the present approximation removes an obvious inadequacy of an earlier linear-approximation treatment.