Dielectric relaxation studies in 5CB nematic liquid crystal at 9 GHz under the influence of external magnetic field using microwave cavity spectrometer

. 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 di...

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Bibliographic Details
Published inPramāṇa Vol. 76; no. 4; pp. 621 - 628
Main Authors JOHRI, MANOJ, SAXENA, ABHAY, JOHRI, S, SAXENA, S, SINGH, D P
Format Journal Article
LanguageEnglish
Published India Springer-Verlag 01.04.2011
Subjects
Astronomy
Astrophysics and Astroparticles
Observations and Techniques
Physics
Physics and Astronomy
Dielectric relaxation; phase transition; liquid crystals; microwaves
64.70.-p; 65.40.G; 67.25-du
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Summary:. 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 cm 3 ) of the sample and provides fruitful information about the macroscopic structure of the liquid crystal.
ISSN:0304-4289
0973-7111
DOI:10.1007/s12043-011-0060-0