SOL-GEL SYNTHESIS AND CHARACTERIZATION OF LITHIUM YTTRIUM OXIDE

Louis-Marie Loembe, Zhengyi Fu, Weimin Wang, Hao Wang

Abstract: Lithium yttrium oxide LiYO2 was synthesized for the first time by a simple citric acid-assisted sol-gel method. Three different molar ratios from low to high concentration of lithium precursor were used. The higher lithium precursor content provided purer LiYO2 powders, which were obtained by calcining the amorphous powders from the sol-gel process at lower temperature, compared to those synthesized by solid-state reaction. The optimum experimental conditions for sol-gel preparation process is 1:3 and 1:2 molar ratio of [Li(CH3COO]·2H2O]/[Y(NO3)3·6H2O] at 950°C and 1000°C respectively, with 6 hours of holding time. The reaction and synthesis mechanism for LiYO2 was analyzes and proposed. It was found that the calcination of dried gel generated exothermic reactions and synthesize of LiYO2 was performed by simple reaction of Li2O and Y2O3.

Keywords: Lithium yttrium oxide (LiYO2), Sol–gel synthesis, mechanism

DOI: https://doi.org/10.15623/ijret.2015.0406001