Abstract
Barium titanate (BaTiO3) can form solid solution with many oxides. The present study demonstrates that BaTiO3 can also dissolve a small amount of Ag during co-firing, and its solubility depends strongly on the Ba/Ti ratio. A solid-state reaction was employed in the present study to prepare the BaTiO3 powders with Ba/Ti ratio varied from 0.991 to 1.010. Fine Ag particles were then mixed intimately with the non-stoichiometric BaTiO3 powders. The solubility of Ag in the non-stoichiometric BaTiO3 at 1,350 and 1,390 °C was then determined by using a modified electron-probe micro-analysis (EPMA) technique. The solubility of Ag in Ti-rich BaTiO3 is nearly double that in Ba-rich BaTiO3. The diffusion distance of Ag in the non-stoichiometric BaTiO3 is longer than 5 μm.
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