Effects of Silver and Palladium Doping on the Dielectric Properties of 0.9Pb(Mg _1/3 Nb _2/3 )O ₃ –0.1 PbTiO ₃ Ceramic

Abstract

The doping of silver and palladium into a 0.9Pb‐(Mg 1/3 Nb 2/3 )O 3 –0.1PbTiO 3 (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 ( K max ) from 21000 to 14000 without any conspicuous change in physical properties. Order–disorder transitions in the perovskite structure contributed to the decrease in K max , 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 K max . 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.