Solid-state synthesis and heat capacity measurements of ceramic compounds LiAlSiO4, LiAlSi2O6, LiAlSi3O8, and LiAlSi4O10

Number of lithium-based oxide ceramics in Li-Al-Si-O system were synthesized by solid-state reaction route using Li2CO3, Al2O3, and SiO2. The progress of the reaction was monitored using thermogravimetry. A model-free approach was employed to fit the temperature versus mass loss data. Heat capacities were measured as a function of temperature using differential scanning calorimetry. Variation of lithium/silicon ratio resulted in change in heat capacity and average crystallite size in each compound.