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Optimization of Al2O3 and Li3BO3 Content as Sintering Additives of Li7−x La2.95Ca0.05ZrTaO12 at Low Temperature

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Abstract

Simultaneous effect of Al2O3 and Li3BO3 additions on sintering behavior and Li-ion conductivity of Li7−x La2.95Ca0.05ZrTaO12 (LLCZT) garnet electrolyte sintered at 900°C (10 h) is evaluated. The crystal phase and microstructure of the different composites were evaluated by x-ray diffraction and scanning electron microscopy (SEM), respectively. Electrical properties of the composites with high relative densities (95%) were examined by impedance spectroscopy. The cubic phase was formed for LLCZT sintered with 0–0.21 mol of Al2O3 and 0.70 mol–0.80 mol of Li3BO3. The excess of Al2O3 (0.22 mol) led to the formation of secondary phases. SEM observation revealed the good interconnection between LLCZT grains and the distribution of the glassy phase formed by Li3BO3 and Al2O3. Effective combination of 0.21 mol of Al2O3 and 0.80 mol of Li3BO3 produced denser material with high relative density of 95% and high Li-ion conduction of 1 × 10−4 S/cm at 32°C.

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Authors and Affiliations

  1. Division of Applied Chemistry, Faculty of Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo, 060-8628, Japan

    Nataly Carolina Rosero-Navarro, Akira Miura, Mikio Higuchi & Kiyoharu Tadanaga

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  1. Nataly Carolina Rosero-Navarro
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  2. Akira Miura
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  3. Mikio Higuchi
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  4. Kiyoharu Tadanaga
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Correspondence to Nataly Carolina Rosero-Navarro.

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Rosero-Navarro, N.C., Miura, A., Higuchi, M. et al. Optimization of Al2O3 and Li3BO3 Content as Sintering Additives of Li7−x La2.95Ca0.05ZrTaO12 at Low Temperature. J. Electron. Mater. 46, 497–501 (2017). https://doi.org/10.1007/s11664-016-4924-4

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  • DOI: https://doi.org/10.1007/s11664-016-4924-4

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