TY - JOUR
T1 - Collective Modes, Relaxations, deVries Behavior and Field Influence in SmA and SmC*deVr Phases of Chiral Liquid Crystal Dimer C-10 Bms with Siloxy Spacer
AU - Kumar, A. V.N.Ashok
AU - Zoghaib, W. M.
AU - Chalapathy, P. V.
AU - Srinivasulu, M.
AU - Madhumohan, M. L.N.
AU - Rani, G. Padmaja
AU - Potukuchi, D. M.
N1 - Publisher Copyright:
© 2023, The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature.
PY - 2023/10/2
Y1 - 2023/10/2
N2 - Investigations in chiral liquid crystal dimer with trisiloxy unit on spacer unit, viz. C-10Bms, are reported with respect to its resolved dipole moment. Occurrence of SmA and SmC*
deVr LC phases was characterized by POM and DSC. Relatively enhanced thermal range of LC phases in dimer configuration was detailed. Tilt angle, hysteresis, polarization, collective modes and other low-frequency relaxations were investigated. Primary order parameter revealed validity of critical field model. Moderate tilt for viewing angle and electro-clinic response for switch speed in dimer were addressed. Hysteresis in SmC*
deVr ensued storage capability for memories. Slightly higher activation energy E
a was attributed to siloxy chain on spacer. Goldstone and Soft modes were identified in SmC*
deVr phase. Field influence on Goldstone mode was analyzed. Equivalence of thermal/Arrhenius and field activation energies was observed. Curie-Weiss law for SM revealed strong collective ferroelectric response. Temperature and field trends of dielectric relaxation parameters were addressed in terms of chiral center-based out-of-phase dipole moment. Figure of merit parameters in SmC*
deVr estimated by dielectric loss revealed its relative performance far below the SmA-SmC*
deVr phase transition.
AB - Investigations in chiral liquid crystal dimer with trisiloxy unit on spacer unit, viz. C-10Bms, are reported with respect to its resolved dipole moment. Occurrence of SmA and SmC*
deVr LC phases was characterized by POM and DSC. Relatively enhanced thermal range of LC phases in dimer configuration was detailed. Tilt angle, hysteresis, polarization, collective modes and other low-frequency relaxations were investigated. Primary order parameter revealed validity of critical field model. Moderate tilt for viewing angle and electro-clinic response for switch speed in dimer were addressed. Hysteresis in SmC*
deVr ensued storage capability for memories. Slightly higher activation energy E
a was attributed to siloxy chain on spacer. Goldstone and Soft modes were identified in SmC*
deVr phase. Field influence on Goldstone mode was analyzed. Equivalence of thermal/Arrhenius and field activation energies was observed. Curie-Weiss law for SM revealed strong collective ferroelectric response. Temperature and field trends of dielectric relaxation parameters were addressed in terms of chiral center-based out-of-phase dipole moment. Figure of merit parameters in SmC*
deVr estimated by dielectric loss revealed its relative performance far below the SmA-SmC*
deVr phase transition.
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UR - https://www.mendeley.com/catalogue/cdba3fb3-7ca7-3d3e-9fe6-71f6a12baffd/
U2 - 10.1140/epje/s10189-023-00326-2
DO - 10.1140/epje/s10189-023-00326-2
M3 - Article
C2 - 37782358
AN - SCOPUS:85173612171
SN - 1292-8941
VL - 46
JO - European Physical Journal E
JF - European Physical Journal E
IS - 10
M1 - 89
ER -