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Dielectric relaxation; phase transition; liquid crystals; microwaves.

Resonance width, shift in resonance frequency, relaxation time and activation energy of 5CB nematic liquid crystal are measured using microwave cavity technique under the influence of an external magnetic field at 9 GHz and at different temperatures. The dielectric response in liquid crystal at different temperatures and the effects of applied magnetic field on transition temperatures are studied in the present work. The technique needs a small quantity (< 0.001 cm³) of the sample and provides fruitful information about the macroscopic structure of the liquid crystal.

Manoj Johri¹ Abhay Saxena¹ S Johri¹ S Saxena² D P Singh¹

1. Department of Physics & Electronics; Dayanand Anglo-Vedic College, Chhatrapati Shahu Ji Maharaj University, Kanpur 208 001, India
2. Department of Chemistry & Biochemistry, Dayanand Anglo-Vedic College, Chhatrapati Shahu Ji Maharaj University, Kanpur 208 001, India

Published

April 2011

Manuscript received

25 March 2009

Manuscript revised

30 August 2010

Accepted

2 December 2010