Dielectric and conductivity relaxation in mixtures of glycerol with LiCl
Dielectric and conductivity relaxation in mixtures of glycerol with LiCl
复制标题
DOI：
10.1140/epje/i2008-10357-8
复制
发表时间：
2008-10-01
影响因子：
1.8
通讯作者：
Loidl, A.
中科院分区：
文献类型：
--
作者：
Koehler, M.;Lunkenheimer, P.;Loidl, A.
我们报告了一个彻底的介电特性的α弛豫的玻璃形成甘油与不同的添加氯化锂。在20 Hz-3GHz的频率范围内研究了0.1 - 20mol%的九种盐浓度，并在介电损耗和模量表示中进行了分析。提供了关于直流电导率、介电弛豫时间（从损耗）和电导率弛豫时间（从模量）的信息。总的来说，随着离子浓度的增加，从reorientationally过渡到conventionally占主导地位的行为观察和平移离子动力学和偶极reorientational动力学成为连续耦合。这就产生了前景，通过添加离子偶极玻璃形成，介电光谱可以直接耦合到确定玻璃化转变的平移自由度，即使在频率制度，通常观察到强去耦。
We report a thorough dielectric characterization of the alpha relaxation of glass-forming glycerol with varying additions of LiCl. Nine salt concentrations from 0.1 to 20mol% are investigated in a frequency range of 20Hz-3GHz and analyzed in the dielectric loss and modulus representation. Information on the dc conductivity, the dielectric relaxation time (from the loss) and the conductivity relaxation time (from the modulus) is provided. Overall, with increasing ion concentration, a transition from reorientationally to translationally dominated behavior is observed and the translational ion dynamics and the dipolar reorientational dynamics become successively coupled. This gives rise to the prospect that, by adding ions to dipolar glass formers, dielectric spectroscopy may directly couple to the translational degrees of freedom determining the glass transition, even in frequency regimes where usually strong decoupling is observed.