The effects of CuO additive on the microstructures, the phase formation and the microwave dielectric properties of MgTiO3-CaTiO3 ceramics were investigated. The sintering temperature of CuO-doped 0.95MgTiO3-0.05CaTiO3 (95MCT) ceramics can be lowered to 1275°C due to the liquid phase effect. The microwave dielectric properties are found strongly correlate with the sintering temperature as well as the amount of CuO addition. At 1275°C, 0.95MgTiO3-0.05CaTiO3 ceramics with 0.25wt.% CuO addition possesses a dielectric constant εr of 20, a Q × f value of 51000 (at 7 GHz) and a τf value of -8.3 ppm°C-1. By appropriately adjusting the x value in the (1 - x)MgTiO3-xCaTiO3 ceramic system, zero τf value can be obtained.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics