Physical Review Letters
The results of a high-resolution x-ray-diffraction study of the smectic phases in mixtures of DB7OCN and 8OCB show that the incommensurate smectic-Ai2 phase, previously reported in this mixture, is in fact a coexistence of the partially bilayer smectic-Ad and the bilayer smectic-A2phases at a first-order phase transition between them.
Kumar, Satyendra; Chien, Li; and Surendranath, V. (1991). Absence of the Incommensurate Smectic-A Phase in DB7OCN+8OCB Mixtures. Physical Review Letters 67(3), 322-325. doi: 10.1103/PhysRevLett.67.322 Retrieved from http://digitalcommons.kent.edu/phypubs/4