Crystallisation and microstructure of lithium orthosilicate pebbles

摘要: Abstract Slightly overstoichiometric lithium orthosilicate (Li4SiO4) pebbles are fabricated by a melt-spraying process, where the droplets rapidly quenched to room temperature. Depending on their size, solidified exhibit different microstructures. While crystallised always display some pores and cracks, amorphous ones mostly free of any defects. The crystallisation process was therefore investigated decrease amount cracks with aim improving mechanical properties final product. development phases during studied thermoanalysis, X-ray diffraction electron microscopy. takes place in three steps. At about 300–350 °C an unidentified, intermediate phase is nucleated. In second step formation Li4SiO4 at 500 °C, while metasilicate (Li2SiO3) last appear temperatures above 600 °C.