The temperature behaviour of a ferroelectric smectic mixture and the detection of ferroelectric switching by NMR
作者:
M. Winkler,
A. Gil,
D. Geschke,
期刊:
Liquid Crystals
(Taylor Available online 1996)
卷期:
Volume 21,
issue 2
页码: 203-208
ISSN:0267-8292
年代: 1996
DOI:10.1080/02678299608032824
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The orientational order of a ferroelectric mixture has been measured by proton NMR. The alignment of the mesogenic units is reflected in the splitting of the NMR signal into a doublet. Up to a cell thickness of 200 μm, it was possible to produce well-oriented layers in the bookshelf geometry by magnetic orientation of the substances in theB0-field. The angular dependences of the line width of the NMR signal on the tilt angle of the director have been calculated. A ferroelectric switching was detected by measuring the angular dependence of the line width in the switched state. The tilt angle and the orientational order parameter S of the bookshelf samples were estimated at various temperatures.
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