Supplementary Figure 1: Dielectric temperature spectrum for 0.4PNN-0.6PHT with and without La doping, inset shows the fitted dispersion factor .Supplementary Figure 2: Hysteresis loops for 0.4PNN-0.6PHT with and without La doping.Supplementary Figure 3: Bipolar S-E loops for 0.4PNN-0.6PHT with and without La doping. Supplementary Figure 4: Electrostriction curves for 0.4PNN-0.6PHT with and without La doping. Supplementary Figure 5: Leak current for 0.4PNN-0.6PHT with and without La doping under 1 kV/cm and 2 kV/cm electric field.
