05-14U

The generalized exchange $s$-$d$ model for description of thermodynamical properties of dilute amorphous substitutional alloy is used. A scheme of consistent taking into account of the contributions of structural fluctuations to the thermodynamic functions is considered. The functional of the thermodynamic potential is constructed as a functional power series. The configurationally averaged grand thermodynamic potential of the model in the self-consistent field approximations (MFA) and random phase approximation (RPA) is calculated. Self-consistency conditions are given, from which equations for magnetizations and Curie temperature of the paramagnetic-ferromagnetic transition are obtained. The analytical and numerical analysis of equations, comparison results with experimental data for alloy Co$_x$Gd$_{1-x}$ is made.