Electric Field Induced Smectic A to Smectic C Transition in Ferroelectric Liquid Crystals
Electric Field Induced Smectic A to Smectic C Transition in Ferroelectric Liquid Crystals
复制标题
铁电液晶中电场诱导层列 A 到层列 C 的转变
DOI：
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发表时间：
1987
期刊：
影响因子：
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通讯作者：
G. Heppke
中科院分区：
文献类型：
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作者：
C. Bahr;G. Heppke
研究了电场对两种新型铁电液晶SmC*-SmA跃迁的影响。在略高于SmC*-SmA相变的温度下，观察到双磁滞回线，类似于已知的固体陶瓷电体，表明场诱导的一阶铁电相相变。DSC和倾斜角度测量支持了两种化合物的SmC* -SmA跃迁的一级特征。当场强约为50 kV/ cm时，相变温度提高1 K。SmC*-SmA转变温度的位移与外加磁场强度呈线性变化，可以用简单的热力学参数来计算。
Abstract The influence of an electric field on the SmC*-SmA transition of two new ferroelectric liquid crystals is investigated. At temperatures just above the SmC*-SmA transition double hysteresis loops are observed similar to that known for solid Cerroelectrics indicating a field induced first order transition to the ferroelectric phase. The first order character of the SmC* -SmA transition of the two compounds under investigation is supported by DSC and tilt angle measurements. With field strength of about 50 kV/ cm the transition temperature is enhanced by 1 K. The shift of the SmC*-SmA transition temperature, which is found to vary linearly with applied field strength, can be calculated by simple thermodynamic arguments.