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High Resolution X-Ray Diffraction Study Of Smectic Polymorphism And Fluctuations In A Mixture Of Octyl- And Decyl-Oxyphenyl Nitrobenzoyloxy Benzoate, Yushan Shi, George Nounesis, Carl W. Garland, Satyendra Kumar
High Resolution X-Ray Diffraction Study Of Smectic Polymorphism And Fluctuations In A Mixture Of Octyl- And Decyl-Oxyphenyl Nitrobenzoyloxy Benzoate, Yushan Shi, George Nounesis, Carl W. Garland, Satyendra Kumar
Satyendra Kumar
Reentrant nematic phases and smectic antiphases occur as intermediate states between two one-dimensionally ordered frustrated smectic phases, characterized by two competing and, in general, incommensurate smectic density waves. Using high-resolution x-ray diffraction, we have examined the evolution of the two density waves as a function of temperature in all phases of a mixture of polar liquid crystals octyl-and decyl-oxyphenyl nitrobenzoyloxy benzoate (47.4 mol% DB8ONO2+52.6% DB10ONO2). This mixture exhibits at temperatures below 127 degrees C the liquid-crystal phase sequence: smectic-A(d), reentrant nematic phases N-d and N-1, smectic-A(1), tilted antiphase (C) over tilde, smectic-A(2), and smectic-C-2 phases. Detailed investigations of several order-disorder …