A Viable Route for Dense TiO^sub 2^ with a Low Microwave Dielectric Loss

Dense, high-purity TiO... was prepared from commercially available powders. These powders were deagglomerated, colloidally stabilized in aqueous NH..., followed by screening to remove residual agglomerates. Homogeneous compacts were formed using colloidal-filtration followed by sintering. TiO... with >99.5% density and 400 MPa flexural strength was obtained at a sintering temperature as low as 1000...C. The dielectric loss of this TiO2 was 1.4 x 10... at 6.4 GHz at room temperature. This implied that the product of the quality factor and frequency, (Qxf )=f/tan ..., was 46 000 GHz, ...7.6 times higher than 6000 GHz (Q