Tracer diffusion experiments on LISICON and its solid solutions by means of neutron radiography
2004
Abstract Lithium ion diffusion coefficient measurements were carried out on LISICON (Li 3.5 Zn 0.25 GeO 4 ) and on a zinc-rich analogue (ZRA; Li 3 Zn 0.5 GeO 4 ) using neutron radiography (NR). Smearing 6 LiNO 3 -saturated solution on a surface of a rectangle-shaped sample consisting of 7 Li and subsequent annealing enabled the relatively low temperature diffusion experiment down to 300 °C. The measured isotope concentration profiles agreed well with the diffusion model from the surface into the semi-infinite media, and the diffusion coefficients can be obtained for both LISICON and ZRA in the temperature range between 300 and 500 °C. The diffusion coefficient of LISICON is essentially larger than that of ZRA, while similar a Haven ratio was found. This indicated that the larger conductivity in LISICON was mainly caused by the higher lithium ion mobility and not by the difference of diffusion path.
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