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Liquid Crystals and their Application
Russian Journal

Zhidkie kristally i ikh prakticheskoe ispol'zovanie

Жидкие кристаллы и их практическое использование

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Rus Eng


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Zhidk. krist. ikh prakt. ispol'z. = Liq. Cryst. and their Appl., 2008, 3, 60—67.

Acoustic Parameters of Smectic B

A. S. Kashitsyn

Author affiliations
Shuya State Pedagogical University, Department of Physical Education
155900 Shuya, Kooperativnaja Str., 24

The temperature dependencies of velocity and attenuation coefficient of longitudinal ultrasound at frequency 3 – 27 MHz were obtained. The measurements were carried out for different orientation of wave vector and premary orientation of smectic normals. Experimental results are compared with theoretical predictions. It is shown that ultrasound velocity is increased at temperature phase transition to smectic B. The inverse sign of ultrasound velocity anisotropy is observed at phase transition smectic C – smectic B.

Keywords: smectic, ultrasound velocity, attenuation coefficient, phase transitions, anisotropy, elastic module, viscosity coefficient, relaxation, dispersion

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