Optimized crystal structure and microwave dielectric properties of BaZnSi 3 O 8 ‐based ceramics

Abstract In this study, we synthesized BaZnSi 3 O 8 ‐based compounds with monoclinic structures ( P 21 /a ) using a solid‐state method. The crystal structure, phase composition, and microwave dielectric properties of BaZnSi 3 O 8 ‐based ceramics were systematically investigated systematically. X‐ray diffraction (XRD) patterns and scanning electron microscopy (SEM) images proved that the maximum solubility of BaZn 1‐ x Mg x Si 3 O 8 ranged between 0.3 and 0.4. Rietveld refinement and Phillips–Van Vechten–Levine complex chemical bond theory were used to illustrate the relationship between the microwave dielectric performance and lattice parameters. To further improve the properties, we substituted Ba 2+ with Sr 2+ in BaZn 0.8 Mg 0.2 Si 3 O 8 . Ba 1‐ y Sr y Zn 0.8 Mg 0.2 Si 3 O 8 remained in a single‐phase as y increased from 0 to 1.0. We achieved thermal stability of the resonance frequency of the BaZnSi 3 O 8 ‐based ceramics by adjusting TiO 2 to form composite ceramics. After sintering at 1020°C for 5 h, excellent microwave dielectric properties with ε r = 7.44, Q×f = 57,400 GHz, and τ f = − 0.2 ppm/°C were realized in the SrZn 0.8 Mg 0.2 Si 3 O 8 +8 wt %TiO 2 system.