Structure, dielectric and piezoelectric properties of (0.9?x)(Bi0.95La0.05)FeO3?xPbTiO3? 0.1BaZrO3 ceramics

(0.9-x)(Bi_0.95La_0.05)FeO_3-xPbTiO₃-0.1BaZrO₃ (BLF-xPT-BZ) ceramics were synthesized by the conventional solid state reaction method. The X-ray diffraction (XRD) results reflected that phase transformation from rhombohedral (R) to tetragonal (T) took place with increasing the PT content, and the coexistence R and T phases were observed at x = 0.35. The dielectric constant (ε_r), dielectric loss (tanδ), remnant polarization (Pr) and piezoelectric coefficient (d₃₃) increased initially and then decreased with increasing the PT content, and reach to maximum at x = 0.35. The TC, Td, ε_r, d₃₃, S and kp of 0.55BLF-0.35PT- 0.1BZ were 422 °C, 380 °C, 620, 162 pC/N, 0.3 % and 0.272, respectively. It was interesting that the maximum strain of BLF-xPT-BZ ceramics achieves about 0.3% under the electric field of 75 kV/cm, which was larger than that of BiScO₃-PbTiO₃ ceramics.