Room Temperature Ferroelectric Mixture of Chiral and Achiral Thioesters

J.M. Czerwieca,*, M. Ossowska Chruścielb, J. Chruścielb and S. Wróbela a Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland b Institute of Chemistry, University of Podlasie, 3-go Maja 54, 08-110 Siedlce, Poland

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Dielectric properties of the mixture of two thioester compounds: 4-8 alkoxy-benzoate thio-carboxyl S-4 pentyl-phenyl (8OS5), (s)-4 (1-methyl-heptyloxy)biphenyl-4-thio-carboksyl 4-9 alkil-phenyl (MHOBS9) are presented. The chiral compound exhibits nematic (N*) and ferroelectric smectic C* phase (SmC*). The achiral compound shows N, SmA and monotropic SmC and SmB phases. the mixture of both compounds of 0.5 molar fraction shows SmC* in the wider temperature range than pure MHOBS9. The mixture was studied using frequency domain dielectric spectroscopy. Dielectric measurements for the SmC* phase of the mixture revealed Goldstone mode at higher frequencies and Maxwell-Wagner relaxation at low frequencies.

DOI: 10.12693/APhysPolA.117.549 PACS numbers: 77.84.Nh, 78.15.+e, 64.70.M-