展开螺旋结构的临界场的研究

Research on the critical field of unwinding FLC's helix.

本文测量了铁电液晶 FCS10 1在交流电场中展开螺旋结构的临界场与温度、频率的变化关系 .在实验中观察到了滞后现象和重入现象 ,并且从 Sm C*相系统的自由能出发 ,推导出了高频临界场的表达式 ,理论计算值和实验结果符合得较好 .

The dependence of the critical field of unwinding FLC's helix on temperature and frequency in ferroelectric liquid crystal FCS101 under ac electric field is measured. In experiment both the hysteresis and reentering phenomena are observed. Furthermore, a general expression critical field for system's free energy is derived. The theoretical results fit well the experimental data.