Piezoelectric Property and Strain Behavior of Pb ( Yb 0.5 Nb 0.5 ) O 3 – PbHfO 3 – PbTiO 3 Polycrystalline Ceramics

(1− x ) Pb ( Hf 1− y Ti y ) O 3 – x Pb ( Yb 0.5 Nb 0.5 ) O 3 ( x  = 0.10–0.44, y  = 0.55–0.80) ceramics were fabricated. The morphotropic phase boundary ( MPB ) of the ternary system was determined by X ‐ray powder diffraction. The optimum dielectric and piezoelectric properties were achieved in 0.8 Pb ( Hf 0.4 Ti 0.6 ) O 3 –0.2 Pb ( Yb 0.5 Nb 0.5 ) O 3 ceramics with MPB composition, where the dielectric permittivity ε r , piezoelectric coefficient d 33 , planar electromechanical coupling k p , and Curie temperature T c were found to be on the order of 1930,480 pC/N, 62%, and 360°C, respectively. The unipolar strain behavior was evaluated as a function of applied electric field up to 50 kV/cm to investigate the strain nonlinearity and domain wall motion under large drive field, where the high field piezoelectric d 33 * was found to be 620 pm/V for 0.82 Pb ( Hf 0.4 Ti 0.6 ) O 3 –0.18 Pb ( Yb 0.5 Nb 0.5 ) O 3 . In addition, Rayleigh analysis was carried out to study the extrinsic contribution, where the value was found to be in the range 2%–18%.