Effects of Nd2O3 Doping Levels on the Sintering, Microstructures, and Dielectric Properties of MgO–Al2O3–SiO2 Glass‐Ceramics

The effects of Nd 2 O 3 addition on the crystallinities, microstructures, and properties of MgO–Al 2 O 3 –SiO 2 (MAS) glass‐ceramics are investigated. The experimental results show that the addition of Nd 2 O 3 allows complete sintering densification of the MAS at lower temperatures, and appropriate addition ratios increase the crystallinity, promote the formation of Indialite, improve the MAS microstructure, reduce the coefficient of thermal expansion, and optimize the dielectric properties. Ultimately, the best performance is achieved by adding 4 wt% Nd 2 O 3 to the MAS sample and sintering at 1255 °C for 15 min. The bulk density is 2.51 g cm −3 , ε r = 6.50, tan δ = 1.96 × 10 −3 (13 GHz), and CTE = 4.621 ppm °C −1 .