Piezoelectric and Ferroelectric Properties of Bismuth Tungstate Ceramics Fabricated by Spark Plasma Sintering

Single‐phase bismuth tungstate (Bi 2 WO 6 ) ceramics with high relative density (>99%) were fabricated by spark plasma sintering. Ferroelectric, dielectric, and piezoelectric properties of Bi 2 WO 6 ceramics were investigated. Almost saturated polarization–electric field ( P – E ) hysteresis loops with a remanent polarization ( P r ) of ∼16.1 μC/cm 2 and a coercive field ( E c ) of ∼3.7 kV/mm were obtained. Curie point and second phase transition temperatures were observed at 937°±5° and 665°±5°C, respectively. The average piezoelectric constant ( d 33 ) of this high Curie point ceramic is 15±0.2 pCN −1 .