화학공학소재연구정보센터
Molecular Crystals and Liquid Crystals, Vol.409, 389-400, 2004
Study of the SmC alpha* phase by dielectric measurements
The aim of our work was to make precise dielectric measurements to confirm the existence of the SmCalpha* phase in non-fluorinated compound 2 and in bicomponent mixtures composed of compounds 2 and 1 with partially fluorinated terminal chain. From the linear temperature dependences of relaxation frequency f(R) and the inverse dielectric strength Deltaepsilon(-1) obtained by fitting experimental values epsilon'(perpendicular to) and epsilon"(perpendicular to) to the Cole-Cole equation, the SmCalpha* phase was detected in compound 2 and the mixture of 0.9 mole fraction of compound 2 due to the changes of the slopes observed at SmA double right arrow SmCalpha* and SmCalpha* double right arrow SmC*. C*. The relaxation processes observed in the SmCalpha* phase of investigated systems are strongly modified under bias, thus they are probably connected with the ferroelectric-like structure of this phase.