Sintering behavior, phase composition, microstructure, and dielectric properties of low-permittivity alkaline earth silicate Sr3MgSi2O8 ceramics.

Microwave dielectric materials with low permittivity and high quality factor are the cornerstone of high-speed data transmission. This paper prepared a new low-permittivity microwave dielectric ceramic Sr₃MgSi₂O₈ (SMS) by a solid-state reaction method. SMS ceramics belonged to the monoclinic system (space group: P2₁/a) at 1375 °C ~ 1475 °C, accompanied by the formation of small amount of Sr₂SiO₄ second phase (space group: P2₁/n). SMS ceramics has the lowest damping at 1450 °C. With the increase in sintering temperature, the relative density of ceramics increases firstly and then decreases, reaching the maximum value (95.82%) at 1450 °C. The SMS ceramics sintered at 1450 °C for 4 h have the best microwave dielectric properties of ε_r = 11.06, Q × f = 25,375 GHz, and τ_f = − 57.41 ppm/°C. [ABSTRACT FROM AUTHOR]