Dielectric properties of barium magnesiotitanate ceramics, BaMg6Ti6O19

Phase-pure samples of barium magnesiotitanate, BaMg6Ti6O19 (BMT) are prepared by the wet chemical ‘gel–carbonate’ method wherein the formation of BMT is complete below 950 °C as a result of the reaction between nanoparticles of BaCO3, MgO and TiO2. BMT powders are sintered at 1350–1450 °C to dense ceramics. Extensive melting is noticed when the bulk composition falls between (0.4MgTiO3 + 0.6BaTiO3) and (0.6MgTiO3 + 0.4BaTiO3) along the MgTiO3–BaTiO3 tie-line in BaO–MgO–TiO2 phase diagram. Dielectric properties of sintered (BMT) ceramics have been investigated which showed ɛ ≃ 39 at 2 GHz, quality factor Q ≥ 10,000 and positive temperature coefficient of dielectric constant around 370 ppm °C− 1.