Effects of Li_2O_3-B_2O_3-SiO_2 addition on dielectric properties and microstructure of MgO-TiO_2-ZnO-CaO ceramics

摘要

The effect of Li_2O_3-B_2O_3-SiO_2 (LBS) liquid-phase additives on the sintering, microstructures, and dielectric properties of MgO-TiO_2-ZnO-CaO (MTZC) ceramics was investigated. It was found that the sintering temperature could be lowered easily, and the dielectric properties of MTZC ceramics could be greatly improved by adding a small amount of LBS solution additives. With the addition of 10 wt% LBS, the ceramics sintered at 900 ℃ showed favorable dielectric properties with ε_r = 21.7, Qf = 5.0 × 10~4 GHz, and TCF = -21.6 ppm/ ℃. The distinctive physical analysis showed an excellent co-firing interfacial behavior between the MTZC ceramic and the Ag electrode. It indicated that MTZC ceramics with LBS solution additives have a number of potential applications on passive integrated devices based on the low-temperature co-fired ceramics technology.