The effect of 24c-site (A) cation substitution on the tetragonal–cubic phase transition in Li7−xLa3−xAxZr2O12 garnet-based ceramic electrolyte
作者： Ezhiylmurugan Rangasamy , Jeff Wolfenstine , Jan Allen , Jeff Sakamoto
DOI: 10.1016/J.JPOWSOUR.2012.12.076
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摘要: Abstract The garnet-type ceramic electrolyte of nominal composition Li 7 La 3 Zr 2 O 12 can exist in the tetragonal and cubic form. This article investigates to phase transition based on super-valent cation substitution 24c site typically occupied by (3+) garnet structure. Ce (4+) was selected as the represented as x 7− 3− . doping study showed that LLZO stabilized for Ce ≥ 0.2. These data agree with most literature reports suggesting creation vacancies, while maintaining oxygen stoichiometry, is necessary stabilize LLZO. Moreover, this work suggests a critical vacancy concentration (0.12–0.4 mol per mole ) While addition LLZO, total ionic conductivity (0.014 mS cm −1 considerably lower compared Al Ta doped (0.4–0.9 mS cm , respectively). likely due CeO precipitation at grain boundaries.
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