Colored Si3N4 ceramics via constructing Nd3+ doped core-shell structures

Si3N4 ceramics have been attractive casing materials for electronics devices under the 5th generation mobile communication technology because of its outstanding comprehensive properties. However, single color cannot meet the needs of most consumers. Here, a typical strategy, involving forming core-shell structures by utilizing Nd2O3-MgO-YAG system, is proposed to rich color. Scanning transmission electron microscope-energy dispersive X-ray spectrometry results confirm the presence of core-shell structures in the silicon nitride matrix, and the core is pore and the shell is Nd-enriched liquid phase. The Nd-rich core-shell structure as the color center makes the silicon nitride appear cyan or blue.