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Abstract
The phase situation in a few members of 4,4′-dialkylbiphenyl homologous series were investigated. Different orthogonal smectic E phases existing in the temperature range below the smectic Bcryst phase were observed. The simultaneous existence of three different smectic E phases in 4-pentyl 4′-hexylbiphenyl by thermomicroscopic, DSC and rentgenographic methods was confirmed. The miscibility studies were used to assign these phases to other smectic phases existing in other members of this homologous series.