The Critical Behaviour of Nonlinear Dielectric Constants of Ferroelectric Liquid Crystals in the Smectic A Phase
The Critical Behaviour of Nonlinear Dielectric Constants of Ferroelectric Liquid Crystals in the Smectic A Phase
复制标题
近晶A相铁电液晶非线性介电常数的临界行为
DOI：
10.1080/10587259508033469
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
R. Hayakawa
中科院分区：
文献类型：
--
作者：
Y. Kimura;R. Hayakawa
摘要研究了SMA-SMC相变附近SMA相中线性和高阶非线性介电常数的临界行为。实验测得的线性介电常数、三阶介电常数和五阶介电常数的临界指数分别为1、4和7。这些指数和非线性介电常数的符号与Landau型唯象理论计算的结果符合得很好。文中还研究了相变顺序(一阶或二阶)对临界行为的影响。
Abstract The critical behaviors of the linear and higher-order nonlinear dielectric constants of ferroelectric liquid crystals (FLCs) are studied in the SmA phase near the SmA-SmC* phase transition. The critical exponents of the linear, third-order and fifth-order dielectric constants experimentally obtained are 1, 4 and 7, respectively. These exponents and the signs of nonlinear dielectric constants are in good agreement with those calculated theoretically from the phenomenological theory of Landau type. The influence of the order of phase transition (first or second) on the critical behavior of FLCs is also studied.