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The principal electrical conductivities σ∥ and σ⊥ have been studied as functions of temperature in the nematic, smectic A and re-entrant nematic phases of a pure compound, 4-cyanophenyl-3′- methyl-r)4′-n-dodecylbenzoyloxy)benzoate, and a 35.8/64.2 weight mixture of 6 OCB and 8 OCB. In both cases, the ratio R(= σ∥/σ⊥) in the smectic phase exhibits a marked pretransitional increase on aproaching the re-entarant nematic phase.
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