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 measurements in the ternary system N,N-dimetylformamide+n-heptane+toluene. We determined the critical decomposition line in a concentration range of 0 up to 25 mole-% toluene. In seven mixtures along this line we obtained the correlation 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 systematic growth if the fraction of the third component increases. This growth exceeds the values for critical exponents that were predicted by the critical exponent renormalization.