The Topology of the P-T Diagram of DOBBCA in the Vicinity of the Reentrant Nematic—Smectic C—Smectic A Multicritical Point

The P-T diagram of 4(4-n-decyloxybenzoyloxy)-benzylidene-4′-cyanoanihe shows a new kind of multicriticd point, viz., a reentrant nematic-smectic C-smectic A point, at 0.55 ± 0.01 kbar and 86.8 ± 0.1° C. The topology of the diagram close to this point has been studied using precise optical hgh pressure techniques.