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Liquid crystal phases of the polar molecule DB9ONO2 display fluctuations on two incommensurate and temperature dependent length scales. We have used high resolution X-ray scattering to study the structure of this material between 80 °C and 230 °C at atmospheric pressure. We confirm the previously reported phase sequence of multiply reentrant nematic phases. The low temperature nematic phases are highly ordered, with correlation lengths exceeding 3 300 A far from the phase boundary. We find evidence of an S c phase between the low temperature SA1 and Sc phases.
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Fontes et al. (1986) studied this question.
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