A liquid crystalline chiral tartrate with p′-nitoazobenzene mesogenic moiety was found to show cholesteric and chiral smectic phases. In the chiral smectic phase, the tartrate exhibited the ferroelectric properties. The mode value of spontaneous polarization was 5 mC/m2 at 90 °C.
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Ujiie et al. (1989) studied this question.
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