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

Abstract

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.

Preparation of high‐purity α‐Si3N4 powder via multifunctional synergistic catalysis and pretreatment method

“…Serving as a pivotal ceramic structural material, Si 3 N 4 finds extensive application in semiconductor, metallurgy, aerospace, machinery, photovoltaic, medical, and fine grinding industries because of its excellent chemical stability, heat and wear resistance, good insulation performance, high strength, and good thermal shock resistance. [1][2][3][4][5][6][7][8] Si 3 N 4 powder is one of the crucial raw materials of Si 3 N 4 ceramics. It primarily exists in two forms, α-Si 3 N 4 and β-Si 3 N 4 .…”