Low temperature sintering and dielectric properties of Ba_2Ti_3Nb_4O_(18) ceramics for silver co-sintering application

摘要

Low temperature sintering and dielectric properties of Ba_2Ti_3Nb_4O_(18) ceramics with ZnO-B_2O_3-SiO_2 (ZBS) frit and lithium salts addition were investigated for silver co-sintering application. The sintering temperature of dense Ba_2Ti_3Nb_4O_(18) ceramics with ZBS frit or LiNO_3 addition was effectively lowered to 950 or 1,000 ℃, respectively. LiNO_3 is found to be more efficient than LiF or Li_2CO_3 to lower the sintering temperature of Ba_2Ti_3Nb_4O_(18) ceramics. The sintering temperature of 900 ℃ was obtained for the Ba_2Ti_3Nb_4O_(18) ceramics with a combination of ZBS frit and LiNO_3 addition. The dielectric properties of Ba_2Ti_3Nb_4O_(18) ceramics with 1 wt.% ZBS and 0.5 wt.% LiNO_3 sintered at 900 ℃ are as follows: ε_r ～ 37.8, tan δ ～ 0.0003, τ_ε ～ 4.6 ppm/℃.