Barium titanate (BaTiO3) was synthesized and sintered by microwave processing at 2.45 GHz. Appropriate amounts of BaCO3
and TiO2 were used as starting materials for the synthesis. BaTiO3 phase was obtained by heating the precursors in a multimode
micr...
Barium titanate (BaTiO3) was synthesized and sintered by microwave processing at 2.45 GHz. Appropriate amounts of BaCO3
and TiO2 were used as starting materials for the synthesis. BaTiO3 phase was obtained by heating the precursors in a multimode
microwave cavity at 1450oC for just 25 minutes. The synthesis and sintering were carried out in air. A relative density
of 97% was obtained. By contrast, it was found that to achieve the same densification, it required 4 hours of soaking at 1450oC
in a conventional sintering process. The dielectric properties show the abrupt discontinuities in dielectric constant vs.
temperature plots; typical properties of first order transitions. Above the Curie temperature the dielectric constant follows
Curie-Weiss law with Curie constant C=1.3-1.4´105 oC.