Dielectric relaxation of dye-doped ferroelectric liquid crystal mixture: A comparative study of smectic C* and smectic A phase

被引：23

作者：

Srivastava, Abhishek Kumar ^{[1
]}

Manohar, Rajiv

Shukla, J. P.

Biradar, A. M.

机构：

[1] Univ Lucknow, Dept Phys, Lucknow 226007, Uttar Pradesh, India

[2] Natl Phys Lab, New Delhi 110012, India

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS | 2007年 / 46卷 / 3A期

关键词：

ferroelectric liquid crystals; guest host effect; dielectric permittivity; dielectric strength;

D O I：

10.1143/JJAP.46.1100

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Present investigation reports dielectric relaxation behaviour of a ferroelectric liquid crystal mixture with and without doping of Anthraquinone dye. Dielectric properties of dye doped and pure ferroelectric liquid crystal mixture has been investigated as a function of temperature and frequency. In the present investigation Goldstone mode has been observed in smectic C* (SmC*) phase, while soft mode is observed in smectic A (SmA) phase and they have been explained with the help of Cole-Cole function. It has also been observed that the addition of dye strengthens the helix in SmC* phase, which is indicated by higher relaxation frequency and dielectric strength of the dye doped ferroelectric liquid crystal mixture. The SmC*-SmA phase transition point become sharper with the addition of dye in ferroelectric liquid crystal material and also shifted towards lower temperature side.

引用

页码：1100 / 1105

页数：6

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