ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
A study of the dielectric response as a function of frequency (20–106 Hz) and temperature in smectic ferroelectric liquid crystals HmPBNP, m=6,8–12,16, has been carried out. For m=10–12, it reveals a transition sequence of five phases: crystal–SmC*γ–SmC*–SmC*α–SmA. Three Goldstone modes have been identified in different temperature intervals associated with SmC*γ, SmC*, and SmC*α phases, respectively. The ferroelectric phases almost totally disappear for m=6. An unexpected antiferroelectric (AF)-like phase accompanied by the ferroelectric phases forms for m=8. The formation of the AF-like phase might be explained by the fast increase of the relaxation frequencies of the Goldstone modes due to the reduction of the alkyl chain in H8PBNP. © 1996 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.361198
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