Pressure Studies on Anomalous Dielectric Behavior in Ferroelectric Liquid Crystals

Anomalous dielectric behaviors in 3M2CPOOB with extremely large spontaneous polarization P s and in 2MBNCBC indicating the reversal of the sign of the P s have been studied under hydrostatic pressure up to 2 kbar. The slope of the pressure-temperature phase diagram was comparable to that of DOBAMBC and other smectic liquid crystals, suggesting that the ferroelectricity is not influenced strongly. Anomalies in both compounds were not influenced by the application of pressures of less than 2 kbar.