PHASE-TRANSITIONS IN AN ANTIFERROELECTRIC LIQUID-CRYSTAL TFMHPOBC

被引：20

作者：

FUJIKAWA, T

ORIHARA, H

ISHIBASHI, Y

YAMADA, Y

YAMAMOTO, N

MORI, K

NAKAMURA, K

SUZUKI, Y

HAGIWARA, T

KAWAMURA, I

机构：

[1] NIPPONDENSO CO LTD,DEPT DISPLAY DEVICE RES & DEV,NISHIO 445,JAPAN

[2] SHOWA SHELL SEKIYU CO LTD,CENT RES & DEV LAB,ATSUGI 24302,JAPAN

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS | 1991年 / 30卷 / 11A期

关键词：

ANTIFERROELECTRIC PHASE; FERROELECTRIC PHASE; SOFT MODE; GOLDSTONE MODE;

D O I：

10.1143/JJAP.30.2826

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We studied phase transitions in an antiferroelectric liquid crystal TFMHPOBC (CBH170-para-phenylene-para-phenylene-COO-para-phenylene -star-CH(CF3) C6H13)by means of dielectric measurements and microscopic opservations. Both a Goldstone mode and a soft mode were observed in the SmC* phase, but only a soft mode in the SmC(A)* phase. From the temperature dependence of the relaxational frequency, it was clarified that the ferroelectric mode tends to be soft even in the antiferroelectric phase transition. The unwinding process of the helical structure in the SmC(A)* phase was observed with a reflecting microscope. It was also found that all the transitions, i.e., SmA-SmC(A)*, SmA-SmC* and SmC*-SmC(A)*, are of the first order. We present the E(electric field)-T(temperature) phase diagram of the optically pure TFMHPOBC and the mixture of R- and S-enantiomers.

引用

页码：2826 / 2831

页数：6

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