Abstract
Abstract Pyrochlore-free Pb(Mg 1 3 Nb 2 3 )O3-PbTiO3 (PMN-PT) (up to 40 mol% PT) perovskite ceramics could be fabricated from molten salt synthesized singlephase PMN-PT powders. The sintering was performed using PbZrO3-based packing powders, and PMN ceramics of 93% density were obtained by firing at 1200°C for 30 min. The density decreased with increasing duration of sintering. Dielectric properties of these ceramics were measured at −50 to 150°C in the 0·1–100 kHz frequency region. Typical ferroelectric relaxor behavior was observed in all the ceramics, and the maximum dielectric constant increased with the increasing PT content. The electrostriction for 0·9 PMN-0·1 PT ceramics was investigated, and more than 150 × 10−6 strain at an electric field of 2·0 kV/cm was achieved. This large strain was attributed to the complete disappearance of the pyrochlore phases.
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