Abstract
Ba0.7Sr0.3TiO3–glass–silver (BST–glass–Ag) composites were prepared by the solid state ceramic route. Their percolation behavior and dielectric properties were examined. The pure BST had a percolation limit of 24vol% of silver whereas an addition of 8wt% of 50PbO–30B2O3–20SiO2 (PBS) glass lowered the percolation limit to 14vol% of Ag. Glass addition lowered the sintering temperature of BST from 1300 to 975°C and addition of Ag further lowered the sintering temperature to 925°C, minimizing the Ag loss during sintering. The relative permittivity increased from 2700 for pure BST to about five orders of magnitude in the BST–glass–Ag composites near the percolation threshold.
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