In the case of nonlinear dielectric effect (NDE), temperature measurements of doped binary solutions of critical concentration do not enable a definitive determination of the influence of Fisher’s renormalization on the form of the critical effect. For this reason it was attempted to achieve this from isothermal studies of changes in value of the NDE as a function of a third constituent added to the critical solution. It was ascertained that its value is largely independent of the direction of approach to the critical point. Results of an initial investigation of this type are presented here.

• Received 23 March 1987

DOI:https://doi.org/10.1103/PhysRevA.36.2885