Static light scattering measurements along a critical decomposition line of a ternary liquid mixture

In the present paper we publish results of static light scattering measurem ents in the ternary system N,N-dimetylformamide+n-heptane+toluene. We deter mined the critical decomposition line in a concentration range of 0 up to 2 5 mole-% toluene. In seven mixtures along this line we obtained the correla tion length of fluctuations and the generalized osmotic susceptibility as a function of the temperature. We apply simple, power laws to calculate the critical exponents of both properties. The determined exponents show a syst ematic growth if the fraction of the third component increases. This growth exceeds the values for critical exponents that were predicted by the criti cal exponent renormalization. [S1063-651X(99)09810-4].