Low-temperature sintering and compatibility with silver electrode of Ba4MgTi11O27 microwave dielectric ceramic

Ba4MgTi11O27 microwave dielectric ceramic was investigated using X-ray diffraction, scanning electron microscopy and dielectric measurement. The pure Ba4MgTi11O27 ceramic shows a high sintering temperature (∼1275 °C) and good microwave dielectric properties as Q × f of 19,630 GHz, ɛr of 36.1, τf of 14.6 ppm/°C. It was found that the addition of BaCu(B2O5) (BCB) can effectively lower the sintering temperature from 1275 to 925 °C, and does not induce much degradation of the microwave dielectric properties. The BCB-doped Ba4MgTi11O27 ceramics can be compatible with Ag electrode, which makes it a promising ceramic for LTCC technology application.