Landau model of the RII-RI-RV rotator phases in mixtures of alkanes.
A phenomenological approach to the description of the rotator phases and transitions among them in mixtures of normal alkanes is proposed. The mixture exhibits crystal and three different rotator phases R(II), R(I), and R(V). The two phase regions are formed where the crystal+rotator and rotator+rotator phases coexist. The reason of these two phase regions is discussed by means of the Landau formalism. The influence of the concentration on these transitions and the transition temperatures are discussed by varying the coupling between the concentration variable and the order parameters. The theoretical predictions are found to be in good qualitative agreement with the experimental results.
Mukherjee
Prabir K
PK
Haldia Government College, P.O.-Debhog, District-Purba Medinipur 721657, India. pkmukherje@yahoo.co.in