S. Takai et al., Diffusion coefficient measurement of lithium ion in sintered Li1.33Ti1.67O4 by means of neutron radiography, SOL ST ION, 123(1-4), 1999, pp. 165-172
Neutron radiography (NR) using cold neutron beam was applied to the tracer
diffusion coefficient measurement of lithium ion in Li1.33Ti1.67O4. The dif
fusion couples with different lithium isotope concentrations were annealed
at 860 to 900 degrees C and the isotope profiles of lithium ion in the samp
le were measured by NR. The diffusion profiles obtained for the samples ann
ealed at higher temperatures show good agreement with Fick's law, whereas t
he diffusion was not carried out well at the interface for the lower-temper
ature-annealed samples. The values of diffusion coefficients obtained from
the profile fitting were a little smaller than those expected from the elec
tric conductivity. The NR method was found to be the most useful method to
measure the tracer diffusion coefficient of lithium ion in solids. (C) 1999
Elsevier Science B.V. All rights reserved.