Phase evolution and microwave dielectric properties of (1 - x)(Mg 0.95Co0.05)2TiO4-xTiO2 (x = 0-1) ceramics prepared by the conventional mixed oxide route have been investigated. Increasing the TiO2 content would lead to a main phase transformation from (Mg0.95Co0.05)2TiO 4 to (Mg0.95Co0.05)TiO3, (Mg 0.95Co0.05)Ti2O5 and then TiO 2. Not only did the TiO2 addition compensate the τf, it also lowered the sintering temperature of specimen. A huge drop of Q × f occurs at a 40-60 mol% TiO2 addition was attributed to the formation of (Mg0.95Co0.05)Ti 2O5 phase. Specimen with x = 0.78 can possess an excellent combination of microwave dielectric properties: εr ∼ 24.77, Q × f ∼ 38,500 GHz and τf ∼ -1.3 ppm/°C.
All Science Journal Classification (ASJC) codes
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry