Investigation on low-temperature sinterable behavior and tunable dielectric properties of BLMT glass-Li2ZnTi3O8 composite ceramics

The novel low-temperature sinterable ceramic composites were fabricated by mixing B₂O₃-La₂O₃-MgO-TiO₂ (BLMT) glass with Li₂ZnTi₃O₈ ceramic. All composites could be well sintered at 900?°C for 2?h through liquid-phase sintering and viscous sintering process. With BLMT glass increasing, the main phase of composites changed from Li₂ZnTi₃O₈ to LaBO₃ phase crystallized from glass. Nevertheless, the rutile phase was observed in composites with ≥10?wt% glass, which could adjust the temperature coefficient of resonant frequency (τ_f) to near-zero owing to the opposite τ_f value to other phases. Simultaneously relative permittivity (ε_r) and quality factor (Q$\times$f) could be controlled by varying the content of Li₂ZnTi₃O₈ ceramic and BLMT glass. The composite with 20?wt% glass exhibited excellent dielectric properties: ε_r?=?22.7, Q?×?f?=?19,900?GHz, and τ_f ?=?0.28?ppm/°C. In addition, the good chemical compatibility between the composite with 5?wt% glass and Ag electrode made it as a potential candidate for LTCC technology.