铁电性
液晶
反铁电性
凝聚态物理
极地的
材料科学
相变
偶极子
相(物质)
反平行(数学)
电介质
化学
物理
磁场
光电子学
量子力学
有机化学
天文
作者
Ewan Cruickshank,Paulina Rybak,Magda Majewska,Suzanne Ramsay,Cheng Wang,Chenhui Zhu,Rebecca Walker,John M. D. Storey,Corrie T. Imrie,Ewa Górecka,Damian Pociecha
出处
期刊:ACS omega
[American Chemical Society]
日期:2023-09-18
卷期号:8 (39): 36562-36568
标识
DOI:10.1021/acsomega.3c05884
摘要
We report two new series of compounds that show the ferroelectric nematic, NF, phase in which the terminal chain length is varied. The longer the terminal chain, the weaker the dipole-dipole interactions of the molecules are along the director and thus the lower the temperature at which the axially polar NF phase is formed. For homologues of intermediate chain lengths, between the non-polar and ferroelectric nematic phases, a wide temperature range nematic phase emerges with antiferroelectric character. The size of the antiparallel ferroelectric domains critically increases upon transition to the NF phase. In dielectric studies, both collective ("ferroelectric") and non-collective fluctuations are present, and the "ferroelectric" mode softens weakly at the N-NX phase transition because the polar order in this phase is weak. The transition to the NF phase is characterized by a much stronger lowering of the mode relaxation frequency and an increase in its strength, and a typical critical behavior is observed.
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