Phase Transformation Behavior of Bi_2O_3-ZnO-Nb_2O_5 Ceramics Sintered at Low Temperature

摘要

To co-fire with commercial LTCC (Low Temperature Co-fired Ceramic) materials at 850℃ ～ 880 ℃, different contents of B_2O_3 were added to the Bi_2O_3-ZnO-Nb_2O_5 (BZN) ceramics. The dielectric properties of BZN ceramics sintered at low temperatures were studied. According to the test results, the cubic phase of BZN was transformed into orthorhombic in all the test materials. A BiNbO_4 phase was formed in test materials with 2～5 wt% of B_2O_3 addition. The BiNbO_4 phase was inhibited by extra ZnO addition. The phase transformation of cubic BZN was controlled during the synthesis process of cubic and orthorhombic ZnO-Nb_2O_5 phase with excess ZnO content. The Cubic and orthorhombic phases of BZN could coexist and be sintered densely at 850 ℃/2hr.