Single phase Ba₂Ti₉O₂₀ microwave dielectric ceramics prepared by low temperature liquid phase sintering

Microwave dielectric ceramics of Ba₂Ti₉O₂₀ were prepared by adding PbO-B₂O₃-SiO₂ (PBS) as a liquid phase sintering aid. With the addition of 5 wt% PBS, dense and single-phase Ba₂Ti₉O₂₀ dielectric resonators could be fabricated at a sintering temperature below 1200°C. The microwave dielectric properties of PBS-Ba₂Ti₉O₂₀ ceramics were found to depend upon the density, the amount of liquid phase and the sintering temperature. Although glass addition results in a decrease of the dielectric properties, the sintered PBS-Ba₂Ti₉O₂₀ ceramics still exhibit much better dielectric properties than that of pure Ba₂Ti₉O₂₀ ceramics at low sintering temperatures.