Effect of molding process on sintering and properties of (Mg_1-xZn_x)₂SiO₄ high-frequency dielectric ceramics

(Mg_1-xZn_x)₂SiO₄ (x = 0.2, 0.4, 0.6, 0.8) ceramics were prepared by different molding methods, the sintering characteristics and high-frequency dielectric properties of ceramics with different ratios were studied, and the optimum Mg/Zn ratio was determined under the experimental conditions. X-ray diffraction (XRD) patterns show that the specimens have a Forsterite structure when x < 0.4, while when x ≥ 0.4, the specimens have a Willemite structure. SEM images suggested that the density of hot pressing (Mg_0.4Zn_0.6)₂SiO₄ ceramics is better than that of dry pressing. The (Mg_1-xZn_x)₂SiO₄ ceramics obtained by hot pressing show an overall increase in bulk density. (Mg_0.4Zn_0.6)₂SiO₄ ceramics have the best high-frequency dielectric properties when sintered at 1325 °C, and the performance parameters of dry pressing and hot pressing are ε_r = 6.74, tanδ = 8.88 × 10^–4 and ε_r = 6.36, tanδ = 1.35 × 10^–3, respectively.