Synthesis of LiDyO 2 by Solid-State Reaction Process and Study of Reaction Kinetics by Using TG-DTA and XRD Techniques.

Lithium-doped dysprosium oxide (LiDyO2) is a potential material for high-temperature applications of solid-state batteries. Experiments were conducted to synthesize LiDyO2by the solid-state reaction of lithium carbonate (Li2CO3) and dysprosium oxide (Dy2O3). The XRD pattern of the synthesized powder confirmed the formation of single-phase LiDyO2. From the TG-DTA study it was observed that the decomposition of Li2CO3starts at 740.9°C and the reaction between Li2CO3and Dy2O3starts at 750°C. The XRD analysis confirmed that mass loss observed in the TG-DTA study for the mixture of Li2CO3and Dy2O3at 750°C is due to the formation of LiDyO2. From the kinetic study it was found that the reaction of Li2CO3and Dy2O3follows nucleation mechanism. It was found that the best fitted model for reaction is the power law P4 nucleation model. Ozawa–Flynn–Wall method is the best suited method for fitting of the solid-state reaction model for reaction of Li2CO3and Dy2O3. The activation energy and pre-exponential factor for reaction of Li2CO3and Dy2O3were determined as 561–631 kJ/mol and 15.34–26.90 min−1, respectively. [ABSTRACT FROM PUBLISHER]