Microstructure and properties evaluation of TiO2 ceramics with multi-oxides glass additions

Abstract A unique glass composition based on GeO 2 , MoO 3 and V 2 O 5 (GMV) was designed to act as a sintering aid to enhance the densification and to adjust the dielectric constant of TiO 2 . This allows the low temperature co-fired ceramic processing (LTCC) of approximately 750 °C to be feasible with a desirable dielectric property. The effect of GMV glass concentration on the densification behavior and dielectrics properties of TiO 2 was investigated by dilatometer, x-ray diffractometer, scanning electron microscopy and transmission electron microscopy. The addition of glass not only was found to accelerate the TiO 2 phase transformation from anatase to rutile, but also to increase the densification rate and the grain size of TiO 2 . The glass additive formed a thin continuous liquid phase and rearranged TiO 2 particles into a dense microstructure at much lower temperature. The dielectric constants of TiO 2 were ranged from 28 to 45 depending on the concentration of glass additive, while the dielectric loss was decreased with the glass concentration as a result of denser TiO 2 microstructure.