Physicochemical Properties of Mixtures of Chlorine Chloride and Urea at the Eutectic Point and in the Adjacent Region

The authors study the phase transitions, densities, and dynamic viscosities of choline chloride and urea mixtures. Temperature dependences of viscosity and density are described by empirical equations. It is shown that raising the concentration of urea in the eutectic system lowers the viscosity and increases the density of the mixture. A phase transition to the glassy state at a temperature of 211 K is detected for relin and does not shift upon changing the composition of the mixture.