DIELECTRIC-RELAXATION OF AQUEOUS-ELECTROLYTE SOLUTIONS .2. ION-PAIR RELAXATION OF 1/2, 2/1, AND 2/2 ELECTROLYTES
DIELECTRIC-RELAXATION OF AQUEOUS-ELECTROLYTE SOLUTIONS .2. ION-PAIR RELAXATION OF 1/2, 2/1, AND 2/2 ELECTROLYTES
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DOI：
10.1002/bbpc.19920961015
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发表时间：
1992-10-01
期刊：
影响因子：
--
通讯作者：
BUCHNER, R
中科院分区：
文献类型：
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作者：
BARTHEL, J;HETZENAUER, H;BUCHNER, R
研究了MgSO4、CdSO4、Na2SO4、CdCl2和CuCl2水溶液复介电常数谱的低频弛豫过程。在椭球体修正卡维尔方程的基础上，借助模型计算分析了色散振幅。结果表明，离子对是低频弛豫过程的主要原因，其中溶剂分离离子对主要是硫酸盐，而接触离子对主要是氯化物。观察到的弛豫时间被分析为化学弛豫和重定向弛豫的叠加。对于离子对，确定了有效旋转体积和形成速率常数。结果与文献资料进行了比较。
The low-frequency relaxation process contributing to the complex permittivity spectra of aqueous solutions Of MgSO4, CdSO4, Na2SO4, CdCl2, and CuCl2 is investigated. The dispersion amplitudes are analysed with the help of model calculations, based on a modified Cavell equation for ellipsoidal bodies. It is shown that ion pairs are responsible for the low-frequency relaxation process with solvent separated ion pairs dominating for the sulfates, whereas contact ion pairs are formed by the chlorides. The observed relaxation time is analysed as the superposition of chemical and reorientational relaxation. For the ion pairs the effective volumes of rotation and the rate constants of formation are determined. The results are compared with information from the literature.