Orientational ordering in polymorphic terepthal-bis-4-butylaniline (TBBA)

被引：3

作者：

Bokare, AD

Das, D

Amenitsch, H

Patnaik, A ^{[1
]}

机构：

[1] Indian Inst Technol, Dept Chem, Chennai 600036, India

[2] DAEF, IUC, Kolkata 700091, W Bengal, India

[3] Sincrotrone Trieste, I-34012 Bassovizza, Italy

来源：

SOLID STATE COMMUNICATIONS | 2002年 / 122卷 / 06期

关键词：

liquid crystals; X-ray scattering; phase transitions; positron spectroscopy; synchrotron radiation;

D O I：

10.1016/S0038-1098(02)00151-5

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Individual molecular tilt angle behavior in the smectic C region is represented upon application of a molecular statistical model to the polymorphic terepthal-bis-butylaniline (TBBA) in conjunction with the experimental layer spacings from SAXS measurements using the synchrotron X-ray beam. In the smectic A and smectic H phases of the mesogen, the order parameter fluctuations and pre-transitional effects responsible for sharp changes in the layer spacing and scattered intensities near the phase transition temperature are corroborated with varying positron annihilation lineshapes as a result of electron density fluctuations. (C) 2002 Published by Elsevier Science Ltd.

引用

页码：329 / 333

页数：5

共 16 条

[1] EVIDENCE FOR CYBOTACTIC CLUSTER PRE-TRANSITION FORMATION IN TBBA LIQUID-CRYSTAL [J].