| Sample/Property | Dielectric Constant εr (at 1 Kz) | Dielectric loss (tanδ) | d33 (×10−12) CN−1 | g33 (×10−3) (VmN−1) | Electromechanical Coupling Coefficient, K2 |
| PZT-4 Reference [31] | 1400 | 0.05 | 225 | 8.5 | 0.35 |
| KNBT with MPB structure | 891 ± 0.031 | 0.031 ± 0.002 | 88 ± 5 | 10.4 ± 0.5 | 0.91 ± 0.05 |