The primary changes in the microstr

The primary changes in the microstructure over the 180°C–600°C sintering temperature range could be attributed to the decomposition of Mg(OH)2 and the accompanying release of water and the reaction between MgO and Li2TiO3. The particles appeared to bond with each other to form a great mass of grain boundaries after sintering at 750°C (Fig. 5(e)), forming pores that were larger than those observed at lower sintering temperatures, which are probably attributed to the decomposition of Li2CO3. All the specimens sintered at temperatures above 800°C (Fig. 5(f)) clearly exhibited dense microstructures, with well-developed grains that possessed polyhedron structures. According to the EDS analysis, as illustrated in Fig. 5(h), the normalized atomic ratio of Mg and Ti is approximately 3:1, which corresponds to the Li2Mg3TiO6 phase.