Conductivity-viscosity-structure: unpicking the relationship in an ionic liquid.

Journal article

The relationships between the ionic mobility, the viscosity, and the atomic-scale structure are investigated in computer simulations of mixtures of LiF and the network glass-forming material BeF(2). The simulations span a wide range of compositions, across which the fluidity of the system changes greatly due to the break-up of the Be-F network by the addition of the LiF. The relationship between the conductivity and viscosity passes from that expected for independently diffusing ions in the dilute mixtures to strongly decoupled Li+ migration through a viscous network at higher concentrations. The transition between these régimes is linked to the changing local and intermediate-scale structure in the melts. The decoupling phenomenon is associated with the appearance of migration channels in the network which leads to cooperative effects in the Li+ migration.

Authors: Salanne, M; Simon, C; Turq, P; Madden, P

• Publication status: Published
• Journal: journal of physical chemistry. B
• Volume: 111
• Issue: 18
• Pages: 4678-4684
• Publication date: 2007-05-01
• DOI: 10.1021/jp067073a
• EISSN: 1520-5207
• ISSN: 1520-6106
• Language: English
• Keywords: Beryllium; Ionic Liquids; Electric Conductivity; Viscosity; Models, Molecular; Fluorides; Molecular Structure; Computer Simulation; Lithium Compounds