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X-ray Studies on Layer Stacking and Ordering in a Liquid Crystalline Disubstituted Biphenylcyclohexane

Abstract X-ray measurements on disubstituted biphenylcyclohexanc BCH 52 show a crystalline smectic B phase with an ABCA layer stacking in bulk samples when cooled from the nematic to the smectic phase. No temperature dependence of this stacking can be seen. When cooling freely suspended thin films (below 20 μm) from the nematic to the smectic B phase, the obtained X-ray reflexes indicate an arrangement of the molecules in an orthorhombic F like stacking.