Molecular Crystals and Liquid Crystals, Vol.449, 71-77, 2006
Helical pitch in bicomponent mixtures with induced antiferroelectric phase
The induced antiferroelectric phase in bicomponent mixtures of fluorinated compound C6F13C2H4OPhPhCOOPhCOOC*H(CH3)C6H13 and a member of homologous series of CnH2n+1COO(CH2)(3)OPhCOOPhPhCOOC*H(CH3)C6H13 (n = 1-7) are observed. In those systems also SmC alpha* phase was evidenced. The helical pitch was measured and it was found that helical pitch increases with the increase of concentration of fluorinated component in mixture. The pitch of SmCA* phase is longer than for SmC* phase. Additionally the pitch in induced SmCA* phase does not depend on temperature, while in single compounds with SmCA* phase strongly increases.