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Electrical Relaxations in Mixtures of Lithium Chloride and Glycerol

1984; Oxford University Press; Volume: 57; Issue: 3 Linguagem: Inglês

10.1246/bcsj.57.652

1348-0634

F. Scott Howell, Cornelius T. Moynihan, Pedro B. Macedo,

Ionic liquids properties and applications

Abstract The dielectric constant ε′ and the electrical conductivity σ were measured as a function of frequency (0.1–2 MHz) and temperature for an electrolyte-polar solvent system: lithium chloride in glycerol. Mole fractions of LiCl were 0, 1, 2, 5, 10, 20, and 33.3%. Data were analysed in terms of an inverse complex permittivity(electrical modulus). At lower mole fractions, two separate modulus relaxations were observed, one due to the ionic diffusion and the other to the dipole reorientation. These two relaxation processes converged with increasing LiCl mole fraction and were not distinguishable at 20%. The moduli isotherms at 33.3% were characteristic of a fused salt. Average relaxation times and distributions for both processes were determined by computer fits to a Gaussian distribution in the logarithms of these times. Their temperature and mole fraction dependences are discussed. The conductivity relaxations became slightly broader than single at 10%; this shows the influence of the charge concentration on the structural relaxation process.