DIELECTRIC PROPERTIESOF SMECTIC-Cα* PHASE

Andika Fajar (Technology Center for Nuclear Industrial Materials (PTBIN) - BATAN Kawasan Puspiptek, Serpong 15314, Tangerang)
Hiroshi Orihara (Division of Applied Physics, Graduate Schoof of Engineering Hokkaido University, Kita 8 Nishi 5, Sapporo 060-0808, Japan)

Jurnal Sains Materi Indonesia
Vol 7, No 3: JUNI 2006

DIELECTRIC PROPERTIESOF SMECTIC-Cα* PHASE. Linear and third-order nonlinear dielectric measurements have been performed within the smectic-Cα* phase of antiferroelectric liquid crystal 4-(1-methyl-heptyloxycarbonyl) phenyl 4-octylcarbonyloxybiphenyl-4-carboxylate (MHPOCBC). In the low temperature region of smectic-Cα* phase, we observed the hysteresis of dielectric constant in cooling and heating process measurement. From the frequency dispersion measurement, it has been found that the frequency relaxation of antiferroelectric Goldstone mode and ‘low frequency mode’, decreased with increasing the temperature until approach the center of the smectic-Cα* phase.