Study of BaO–Nd2O3–TiO2 ceramics doped with Li2O–ZnO–B2O3 glass for LTCC technology

It is necessary to use high-permittivity dielectric ceramics to realize various distributed microwave components in low-temperature co-fired ceramics (LTCC) structures. In this study, the Ba 3.75 Nd 6.5 Sm 3 Ti 17.5 (Cr 0.5 Nb 0.5 ) 0.5 O 54 (BNSTCN) ceramic was doped by Li 2 O–ZnO–B 2 O 3 (LZB) glass to get the densification temperatures of lower than 960 °C . The effects of the LZB glass content on the wetting behavior, densification, and microwave properties were examined. The results showed that the BNSTCN + 4-wt% LZB sample sintered at 950 °C had outstanding microwave dielectric properties: dielectric constant ( ε r ) of 67.5, quality factor ( Q×f ) of 5,186 GHz, and temperature coefficient of resonance frequency ( τ f ) of − 0.6 ppm/°C. Besides, the BNSTCN + 5-wt% LZB sample sintered at 950 °C also presented good microwave dielectric properties: ɛ r = 67.9, Q × f = 4,733 GHz, and τ f = − 3.6 ppm/°C.