Optimization of Alb class="a-plus-plus">2b>Ob class="a-plus-plus">3b> and Lib class="a-plus-plus">3b>BOb class="a-plus-plus">3b> Content as Sintering Additives of Lib class="a-plus-plus">7−x b>Lab class="a-plus-plus">2.95b>Cab class="a-plus-plus">0.05b>ZrTaOb class="a
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Simultaneous effect of Alb>2b>Ob>3b> and Lib>3b>BOb>3b> additions on sintering behavior and Li-ion conductivity of Lib>7−xb>Lab>2.95b>Cab>0.05b>ZrTaOb>12b> (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 Alb>2b>Ob>3b> and 0.70 mol–0.80 mol of Lib>3b>BOb>3b>. The excess of Alb>2b>Ob>3b> (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 Lib>3b>BOb>3b> and Alb>2b>Ob>3b>. Effective combination of 0.21 mol of Alb>2b>Ob>3b> and 0.80 mol of Lib>3b>BOb>3b> 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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