Effects of Silver and Palladium Doping on the Dielectric Properties of 0.9Pb(Mg1/3Nb2/3)O3–0.1 PbTiO3 Ceramic

Abstract

The doping of silver and palladium into a 0.9Pb‐(Mg1/3Nb2/3)O3–0.1PbTiO3 (PMN–PT) ceramic has been investigated. It was found that Ag could be incorporated into the PMN–PT lattice, though this was almost impossible with Pd. Doping at up to 0.2 mol% of Ag and Pd reduced the maximum dielectric constant (Kmax) from 21000 to 14000 without any conspicuous change in physical properties. Order–disorder transitions in the perovskite structure contributed to the decrease in Kmax, since the diffuseness parameter, δ, which represents the degree of the order‐disorder relationship, increased with Ag doping. However, addition of more than 0.2 mol% increased Kmax. Increases in grain size and in the perovskite ratio contributed to this increase. The dielectric properties of Ag/Pd‐doped samples were intermediate between the Ag‐ and Pd‐doped samples.