“…However, these techniques still suffer various disadvantages, such as a broad particle size distribution, difficulty in size and composition control, powder reunion, high nitridation temperature, and long holding time. High temperature liquid phase synthesis method is an environmentally friendly technology, widely applied in the preparation of powder [ 16 , 17 , 18 , 19 ], nano coating [ 20 , 21 , 22 , 23 ], and porous materials [ 24 , 25 , 26 ]. However, there are only a few available reports on the high temperature liquid phase synthesis of silicon nitride powder.…”