Dynamics of phase transitions in a liquid crystalline compound (TBDA) probed by Raman spectroscopy

被引：27

作者：

Dash, SK ^{[1
]}

Singh, RK ^{[1
]}

Alapati, PR ^{[1
]}

Verma, AL ^{[1
]}

机构：

[1] NE HILL UNIV,DEPT PHYS,SHILLONG 793022,MEGHALAYA,INDIA

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1997年 / 9卷 / 37期

关键词：

D O I：

10.1088/0953-8984/9/37/012

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The precise value of linewidths obtained after correcting for the slitwidth effect for five Raman bands associated with the core of a liquid crystalline compound, terepthal-bis-decyl aniline (TBDA), have been studied in the temperature range of 12-472 K. The variation of the linewidth with temperature confirms two already reported phase transitions at 346 and 427 K. However, the phase transition at 427 K is not purely first order as reported earlier, but of mixed order in nature. From the measured linewidths of the nu(phi-N) and nu(C=N) modes below room temperature, the estimated activation energy for rotation along the phi-N bond closely matches with the S-I-S-C phase transition temperature suggesting that the rotation about the phi-N bond is closely linked with this transition.

引用

页码：7809 / 7815

页数：7

共 20 条

[1] DENSITY STUDIES IN TEREPHTHALYLIDENE-BIS-P-N-DECYLANILINE [J].