Solid-Sm C* and Sm C*-Sm a phase transitions in ester ferroelectric liquid

Crystal Mbopdob Physics Department, Center for Materials Analysis and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, P. R. China

Zhen Yin Physics Department, Center for Materials Analysis and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, P. R. China

Ping Zhang Physics Department, Center for Materials Analysis and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, P. R. China

Qiang Chen Physics Department, Center for Materials Analysis and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, P. R. China

Ming-Sheng Zhang Physics Department, Center for Materials Analysis and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, P. R. China

Solid-Sm C* and Sm C*-Sm A phase transitions in ester ferroelectric liquid crystal D-4-(2-methylbu-toxy)phenyl 4-decyloxybenzoate (MBOPDOB) are examined by measurements of Raman spectroscopy and differential scanning calorimetry. The thermal hysteresis, with width about 4°C in temperature from solid to Sm C* phases, is recorded from the temperature-cycle measurements of the 15 and 49 cm-1 modes, manifesting first-order character of the solid-Sm C* transition. The overcooling of the Sm C* phase promotes the ordering of the molecular orientations. Continuously going through the Sm C*-Sm A point of the 93 cm-1 mode and the spontaneous polarization, and very small heat of the transition indicate that the Sm C*-Sm A transition is of a continuous second-order nature which is related to a small spontaneous polarization and a large temperature range of the Sm A phase. A model structure is proposed to discuss the small spontaneous polarization.

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Solid-Sm C* and Sm C*-Sm a phase transitions in ester ferroelectric liquid

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