Phase structure and electrical properties of 0.8Pb(Mg 1/3 Nb 2/3 )O 3 –0.2PbTiO 3 relaxor ferroelectric ceramics prepared by the reaction‐sintering method

Phase pure perovskite 0.8Pb(Mg 1/3 Nb 2/3 )O 3 –0.2PbTiO 3 (0.8PMN–0.2PT) ferroelectric (FE) ceramics were prepared by the reaction‐sintering method at a sintering temperature range of 1200–1250 °C. The sintered ceramics exhibit large relative density, where the 0.8PMN–0.2PT ceramics sintered at 1250 °C possess the largest value of relative density, reaching 99.56% of the theoretical density. All the sintered 0.8PMN–0.2PT ceramics exhibit broad, diffused, and frequency‐dependent dielectric response peaks at around 80 °C and saturated and symmetric P – E hysteresis loops. The 0.8PMN–0.2PT ceramics exhibit excellent electrical properties, where the value of dielectric constant maximum ε m is 35 750 at 1 kHz, the remanent polarization P r is 33.01 µC/cm 2 , the coercive field E c is 2.79 kV/cm, and the piezoelectric constant d 33 is 259 pC/N.