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We investigated the properties of Al-free garnet related Li7La3Zr2O12 (LLZ) and Li7−xLa3Zr2−xTaxO12 (LLZTa) with Ta contents x=0.25, 0.5 and 1.0 synthesized by a solid state reaction method. It was confirmed that all Al-free LLZTa have the cubic garnet related structure, while Al-free LLZ without Ta substitution has a tetragonal one. No other secondary phases were observed in all sintered samples...
Perovskite-type compounds ABO 3 in which A=La, Li and B=Ti (Li 2/3−3x La x TiO 3 , LLT) exhibit very high bulk ionic conductivity of 1.2×10 −3 Scm −1 at 30°C, but LLT has very large grain-boundary resistance and is only stable above 1.6–1.8V vs. Li/Li + because Ti 4+ can be easily reduced to Ti 3+ below this potential. Li ...
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