Bg. Abrosimov et al., Calculation of coordination numbers for a three-component system with a pair interaction potential in the form of a rectangular well, RUSS J PH C, 74(12), 2000, pp. 1996-2000
Coordination numbers in a wide range of input parameters (reduced density,
mixture composition, molecular size) were calculated in the Percus-Yevick a
pproximation for ternary systems with rectangular-well interaction potentia
ls. An exact analytic expression for distribution functions g(ab)(r) was us
ed; the functions were represented as series in powers of density to second
-order terms inclusive. The closest agreement with the results of Monte Car
lo calculations was attained with distribution functions truncated after th
e term first-order in density, which showed that the Mayer expansion poorly
converged for the systems under consideration.