Journal of Physical Studies 7(1), 79–83 (2003) DOI: https://doi.org/10.30970/jps.07.79 CORRELATIVE BEHAVIOUR OF ANISOTROPIC BINARY LIQUID SYSTEM IN THREE-MOMENT APPROXIMATION A. V. Chalyi1, A. N. Vasil'ev2 1National Medical University, Department of Physics, 13 Shevchenko Blvd., Kyiv, UA-01601, Ukraine 2Taras Shevchenko National University of Kyiv, Department of Theoretical Physics, 6 Glushkov Pr., Kyiv, UA-03022, Ukraine

To investigate the correlative properties of anisotropic binary mixture the Ornstein-Zernike system of integral equations is used. The influence of the anisotropy on the critical behaviour of the binary liquid mixture is considered by means of the first non-zero spatial moment for the direct correlation functions. The pair correlation functions in three-moment approximation are found. Basing on the expression for the pair correlation functions it is shown that at the close vicinity of the critical point correlative behaviour of binary mixture can be described in analogue with one-component liquids only by one correlation function. A dependence of the critical temperature on the concentration of the mixture components is considered. It is found that the anisotropy causes the shift of the critical temperature. Close to the critical point the dependence of such a shift on the effective field variable is of a scaling-law form.

PACS number(s): 05.70.Fh, 05.70.Jk

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