Unusual dielectric and electrical switching behavior in the de Vries smectic A phase of two organosiloxane derivatives.
X-ray, electrical, electro-optical, and dielectric studies in the de Vries smectic A (SmA) phase of organosiloxane derivatives exhibit features surprisingly different from that of a conventional SmA phase. The switching data show a double peak profile, characteristic of an antiferroelectric (AF) structure. A model with the adjacent smectic layers having an AF-like arrangement and no global tilt correlation is proposed. Observed in molecules with differential interactions between the two termini, these findings have wide ramifications in understanding the minimum layer shrinkage of such systems.
Prasad
S Krishna
SK
Centre for Liquid Crystal Research, Jalahalli, Bangalore 560 013, India. skpras@gmail.com
Rao
D S Shankar
DS
Sridevi
S
S
Lobo
Chethan V
CV
Ratna
B R
BR
Naciri
Jawad
J
Shashidhar
R
R
D017097:Electric Impedance; D008956:Models, Chemical; D008958:Models, Molecular; D008968:Molecular Conformation; D009930:Organic Chemicals / Q000737:chemistry*; D044367:Phase Transition; D012815:Signal Processing, Computer-Assisted; D012833:Siloxanes / Q000737:chemistry*
D009930:Organic Chemicals; D012833:Siloxanes