- Error

^{1}Laboratorium voor Akoestiek en Termische Fysica, Departement Natuurkunde en Sterrenkunde, Katholieke Universiteit Leuven, Leuven, Belgium

^{2}Departamento de Física Aplicada, Universidad de Vigo (Campus de Ourense), Ourense, Spain

**Keywords:** critical behaviour, dielectric constant, binary liquid mixtures**property:** dielectric constant**material:** nitromethane, 3-pentanol

A systematic experimental study of the critical behavior of the dielectric constant *ε* of binary mixtures comprising different combinations, namely, polar + nonpolar, polar + polar and nonpolar + nonpolar compounds has been carried out motivated by the novel results, i.e a *t*^{2β} singularity in the coexistence-curve diameter predicted by a recent scaling formulation [1]. In this work, we report on results for the polar + polar compounds, namely, the nitromethane + 3-pentanol binary mixture, for which *ε* has been measured in both the one and two-phase regions. Special attention will be given to the critical behavior in the one-phase region along the critical isopleth path (*x *= *x*_{c}):

*ε* = *ε*_{c} + *D*_{1}*t*^{1-α}+*D*_{0}*t*

where *t = (T-T _{c})/T_{c}*, with

*D*_{1} = –[(∂*T _{c}/∂E´*)

where – applies to upper consolute points (UCPs) and E´ =* ε** _{0}*E

- P. Losada-Pérez, G. Pérez-Sánchez, C. A. Cerdeiriña, and J. Thoen, Phys. Rev. E 81, 041121 (2010)
- Y. Tsori, Rev. Mod. Phys. 81, 1471 (2009)

* Official Sponsors*