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A new method to evaluate rotational viscosity η in ferroelectric liquid crystals is proposed. This method is based on the measurement of a polarization switching current upon field reversal. It is shown that a full width at half-maximum of the current peak t w is equal to 1.76η/ P s E , while the area gives twice the spontaneous polarization P s . It is also shown that the sign of a dielectric anisotropy Δε is determined by the asymmetrical shape of the signal. A proportionality between t w and E -1 was confirmed for a surface stabilized ferroelectric liquid crystal cell. The temperature dependences of P s and η are presented.
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Kimura et al. (1987) studied this question.
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