Conductivity of Hot Isostatically Pressed Li0.35La0.55TiO3

Report No. ARL-TR-7401
Authors: Jeff Wolfenstine, Jan Allen, Claire Weiss Brennan, and Victoria Blair
Date/Pages: August 2015; 24 pages
Abstract: The ionic conductivity of Li0.35La0.55TiO3 (LLTO) consolidated using a 2-stage method of solid-state sintering followed by hot isostatatic pressing (hipping) was measured and compared to LLTO densified using conventional solid-state sintering. After sintering and hipping, the LLTO material exhibited near full theoretical density (relative density<99%), a cubic structure, grain size<2.42 µm), and clean grain boundaries with no secondary phases. The room temperature grain boundary conductivity values were <3.8 x 105 S/cm for the sintered and hipped LLTO. Although the sintered and hipped LLTO had a density near full theoretical density, the total conductivity is still somewhat low compared to the value for lattice conductivity (<1.5 x 103 S/cm). These results suggest that in order to increase the grain boundary conductivity of LLTO, achieving full theoretical density alone is not sufficient; the addition of a Li-ion conducting phase along grain boundaries is required.
Distribution: Approved for public release
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Last Update / Reviewed: August 1, 2015