| 초록 |
Low loss dielectric properties of zinc borate glasses modified with rare earth oxides (La2O3, Nd2O3, Sm2O3 and Gd2O3) were investigated for the purpose of developing a new low temperature co-fireable system. The lanthanum borate-based LTCC has been reported to provide unusual high quality factors after firing at 850oC. Several different batches of glass consisting of 60 mol% B2O3, 20 mol% ZnO, and 20 mol% rare earth oxide, i.e., La2O3, Nd2O3, Sm2O3 and Gd2O3 were successfully prepared via the typical glass melting / quenching procedure. A fixed amount of 50 wt% Al2O3 filler was then admixed with the glass to produce final samples. As a specific example of optimized dielectric characteristics, a high quality factor of ~1,090 and a dielectric constant of 8.3 were obtained at ~ 17 GHz for the lanthanum zinc borate materials. Understanding the influence of rare earths on microwave dielectric properties and crystallization behavior of zinc borate dielectrics is the main purpose of this presentation. |
