Abstract
A comprehensive insight into the structure-properties relationship of Ag–BaTiO3 composite ceramics was realized by combining modeling tools with a detailed analysis of macroscopic electrical properties in relationship with microstructural peculiarities. Di-phase Ag–BaTiO3 ceramics (0–5 vol% Ag) with room temperature permittivity values between 2740 and 7085 and low dielectric loss (tan δ < 4%) have been investigated. These composites show an enhancement of tunability from 2 for pure BaTiO3 ceramic to 4 in case of 5 vol% silver addition (at 21.6 kV/cm). The Finite Element Analysis demonstrated that the enhancement of tunability is related to the silver melting during sintering, causing peculiar microstructures, with local percolation channels in the composite’s volume.
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