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VOLUME 34 (1981) | ISSUE 8 | PAGE 447
Critical point on the smectic A-smectic B phase-transition line in MBMBAC
The thermal expansion of MBMBAC (/?-methylbutyl-methoxybenzylidene amino cinnamate) near the SA -SB phase transition has been studied at high pressure. This is a first-order phase transition at low pressures but becomes a continuous one above 1 kbar. The coordinates of the critical point have been established: Tc ^358 К and Pc 1 kbar. The behavior of the density jump Ap at the SA -SB transition in the region of the first-order phase transition is described by Ар ~(Г — Tc )x with χ -0.35.