Critical behavior of the dielectric constant in the triethylamine-water binary liquid mixture: Evidence of an intrinsic effect

Experimental data are presented for the dielectric constant in the homogeneous phase near the consolute point of the binary critical liquid mixture composed of triethylamine and water. From a comparison with existing mass density measurements, it is concluded that the critical anomaly in the static dielectric constant clearly shows a strong intrinsic effect opposite in direction from the one in the mass density. Moreover, a complete picture of the critical behavior of the dielectric properties for this system is drawn by including previously published refractive index measurements. © 1996 The American Physical Society.