Abstract
Barium titanate–silver composites were prepared by using a solid state reaction process with silver contents ranging from 0 mol% to 20 mol%. XRD results and Raman spectra indicated that there was no phase other than BaTiO 3 and Ag in the ceramics and tetragonality of barium titanate reduced with increasing Ag content. SEM images illustrated that Ag influenced densification and microstructure of BaTiO 3 ceramics. Besides, addition of Ag led to increase in dielectric permittivity and broadening of ferroelectric–paraelectric phase transition peak. Also addition of Ag had effects on dielectric loss and dc conductivity. Dielectric and conductivity properties as a function of Ag volume fraction were explained by the percolation theory.
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