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Dielectric Relaxation Studies of 5PCH by the Time Domain Spectroscopy Method

机译:时域光谱法研究5PCH的介电弛豫

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The time domain spectroscopy (TDS) method has been used for the measurement of the complex dielectric permittivity in the isotropic phase and for perpendicular and parallel orientations in the nematic phase of 5PCH (4-(trans-4-pentyl-cyclohexyl)-benzonitrile). The accessible frequencies range from ca 15 MHz to ca. 1.5 GHz. The obtained spectra are well consistent with the spectra measured recently in the frequency domain (T. Brueckert et al., Mol. Cryst. Liq. Cryst., in press). From the relaxation times τ_‖, τ_⊥ and τ_(is) we have calculated the activation enthalpies and the retardation factors g_‖. and g_⊥ that allow to obtain the nematic potential q. The validity of some assumptions of the mean-field theories of the nematic state are discussed.
机译:时域光谱法(TDS)已用于测量5PCH(4-(反式-4-戊基-环己基)-苄腈)的各向同性相和向列相的垂直和平行取向的复介电常数。可访问的频率范围从大约15 MHz到大约20 MHz。 1.5 GHz。所获得的光谱与最近在频域中测得的光谱完全一致(T.Brueckert等人,Mol.Cryst.Liq.Cryst。,印刷中)。从弛豫时间τ_′,τ_⊥和τ_(is),我们计算了活化焓和延迟因子g_′。和g_⊥允许获得向列电势q。讨论了向列态平均场理论的一些假设的有效性。

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