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Binary mixtures of 4-n-alkyl- and 4-w-alkyloxy-4′-cyanobiphenyls with homologous 4,4′-di-n-alkyloxy-azoxybenzenes exhibit the induction of a smectic phase. From some of the phase diagram it can be concluded that the induced smectic phases (ISP) are of the S A  type, and this is probably true for all mixtures studied. The thermal stability of the induced smectic phases can not be correlated with the clearing temperatures of the single components, but a dependence on their ability to form smectic phases is very likely. It is postulated that mixtures of terminal polar and terminal non polar nematic liquid crystals are generally able to exhibit the induction of smectic phases.

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Induktion smektischer Phasen in binären Mischungen nematischer Flüssigkristalle / Induction of Smectic Phases in Binary Mixtures of Nematic Liquid Crystals