Enhanced Quality Factor of Zinc Lanthanum Borates-Based Dielectrics via the Control of ZnO/B^sub 2^O^sub 3^ Ratio

A dielectric system having an exceptionally high-quality factor of 1350 at 16.8 GHz is reported as a strong candidate for glass-based low-temperature cofireable materials. The dielectrics are based on unusual (16-27)ZnO*...*(57-68)... glass mixed with a fixed 50 wt% ... filler. The ratio of ZnO/... was found to be critical in controlling the nature of glass and, consequently, performance of the dielectric mixture. For example, 27ZnO*...*... glass sample having the highest Zn content resulted in the lowest softening temperature of 647...C and the least porosity of ~6%. The enhanced densification and extensive crystallization of low loss phases, i.e., ... and ..., are assumed to be responsible for better dielectric performance that resulted from the increase of Zn content in glass. (ProQuest: ... denotes formulae/symbols omitted.)