Synthesis and microstructure of SrTiO3 and BaTiO3 ceramics by a reaction-sintering process

Strontium titanate and barium titanate ceramics prepared by a reaction-sintering process were investigated. The mixture of raw materials of stoichiometric SrTiO3 and BaTiO3 was pressed and sintered into ceramics without any calcination stage involved. A density 4.99 g/cm3 (97.5% of the theoretic value) was found in SrTiO3 after 6 h sintering at 1,370 C. Grains less than 1.5 lm were formed at 1,300–1,330 C and became 2.2–3.3 lm at 1,350–1,370 C SrTiO3. A density 5.89 g/cm3 (97.9% of the theoretic value) was found in BaTiO3 after 6 h sintering at 1,400 C. Merged grains were observed in BaTiO3 and were less than 10 lm after sintered at 1,400 C.