Electric field application to molten lithium borates

Tooru Katsumata; N. Suzuki; M. Shibasaki; T. Matsuo

doi:10.1117/12.351284

6 July 1999 Electric field application to molten lithium borates

Tooru Katsumata, N. Suzuki, M. Shibasaki, T. Matsuo

Proceedings Volume 3792, Materials Research in Low Gravity II; (1999) https://doi.org/10.1117/12.351284
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

The electrical conductivity and the atomic diffusion of ⁷Li in the molten lithium borates have been evaluated for studying transport phenomena in the melt. The dc electrical conductivity of melt with high viscosity shows exponential temperature dependence, σ=σ_oexp for the specimens with various compositions, x=Li₂O/(Li₂O + B₂O₃). The activation energy of dc conductivity estimated are 1.47eV for x equals 0.2, 1.10eV for x=0.25, 1.23 eV for x=0.34 and 0.77eV for x=0.5, respectively. The thermal activation energy for the atomic diffusion of ⁷Li in the melt evaluated by nuclear magnetic resonance technique, 0.37eV for x=0.07 and 0.69eV for x=0.67. Activation energy of Li diffusion is much smaller than those of the electrical conductivity in boron rich specimens. These are comparable in Li richer specimens. It may be suggested that small motive Li⁺ cations dominate the electric conduction in the molten borates in Li rich specimens. While, the anionic group, boric oxides, which are large in size and difficult to move in the melt may be responsible for the thermal activation of electrical conduction in boron rich specimens.

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Tooru Katsumata, N. Suzuki, M. Shibasaki, and T. Matsuo "Electric field application to molten lithium borates", Proc. SPIE 3792, Materials Research in Low Gravity II, (6 July 1999); https://doi.org/10.1117/12.351284

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