The microwave dielectric properties and microstructure of Mg 1+δTiO3+δ (-0.05 ≤ δ ≤ 0.05) ceramics prepared via the conventional solid-state route were investigated. A slight deviation from stoichiometry does not practically affect the relative permittivity and temperature coefficient of resonant frequency of the specimen. However, the Q × f value is very sensitive to the composition and it shows a non-linear variation corresponding to a relative amount of Mg. A very high Q × f can be achieved for specimen with single MgTiO3 phase, which can be obtained within the compositional range -0.02 ≤ δ ≤ 0.02. In addition, a low Q × f measured for specimens at δ < -0.02 can be attributed to the presence of second phase MgTi2O 5. An extremely high Q × f of ∼357,600 GHz (at 10 GHz) together with an εr of ∼18.3 and a τf of ∼-50 ppm/°C can be found for specimen using Mg1.02TiO 3.02.
All Science Journal Classification (ASJC) codes
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry