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Proceedings Paper

Electric field application to molten lithium borates
Author(s): Tooru Katsumata; N. Suzuki; M. Shibasaki; T. Matsuo
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Paper 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=σoexp 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.

Paper Details

Date Published: 6 July 1999
PDF: 8 pages
Proc. SPIE 3792, Materials Research in Low Gravity II, (6 July 1999); doi: 10.1117/12.351284
Show Author Affiliations
Tooru Katsumata, Toyo Univ. (Japan)
N. Suzuki, Toyo Univ. (Japan)
M. Shibasaki, Toyo Univ. (Japan)
T. Matsuo, Toyo Univ. (Japan)

Published in SPIE Proceedings Vol. 3792:
Materials Research in Low Gravity II
Narayanan Ramachandran, Editor(s)

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