Sintering behaviors and microwave dielectric properties of Ti-modified Ba_3Ti_5Nb_6O_(28) ceramics with 35BaO-35ZnO-30B_2O_3 addition

摘要

AbstractEffect of 35BaO–35ZnO–30B2O3(BZB) addition on the sintering behaviors, phase evolution and microwave dielectric properties of Ti-modified Ba3Ti5Nb6O28(Ba3Ti5.1Nb5.9O27.95, BTNO) ceramics had been investigated. BZB addition effectively reduced the sintering temperature of BTNO from 1250 °C to about 900 °C. With increasing BZB addition, the crystal phase of the present ceramics changed from single phase Ba3Ti5Nb6O28to mixing phases of Ba3Ti5Nb6O28and Ba3Ti4Nb4O21. And the major phase gradually became from Ba3Ti5Nb6O28to Ba3Ti4Nb4O21. Dielectric constant and temperature coefficient increased with the rising of BZB addition. But the Qf value gradually declined from 28000 to about 6000 GHz. The BTNO ceramics with 15% BZB addition exhibited excellent microwave dielectric properties as following: ε = 46.3, Qf = 5887 GHz and τf = 35.5 ppm/°C, which was potential of candidate materials for LTCC application. And the variation of microwave dielectric properties had been also discussed with the phase and microstructure evolution.