Dielectric investigations of the B-2 phase

Two samples consisting of banana-shaped molecules with terminal alkyloxy or terminal alkyl groups were investigated. Dielectric measurements prove the existence of two absorption ranges up to 10 MHz. The high frequency proces s is related to the reorientation of the bulky rigid core characterized by a strong positive dipole correlation in the B-2 phase. The sample with the alkyloxy groups should show a third absorption range at higher frequencies due to ;the fast reorientation of the end groups. The low frequency process seen only in the B-2 phase is explained by the dynamics of ferroelectric c lusters.